Just about at the half-way mark. I was hoping that we'd be a little bit further along, but weekend shipping times seem to be cutting into the schedule. For those at the bottom of the list, we'll be there soon. Realistically, it seems like the tour might take another few weeks. I'd be nice to be finished before May and have the cables sent to their new homes.  

First of all a big thanks to @Kamakahah for setting this up and my apologies for not posting my impressions sooner – life and all that.
 
As time permitted, I spent about 90 minutes straight with each cable, listening to various genres. Music files were MP3, FLAC, WAV, PCM and DSD. I then started switching cables. I tried to be systematic about it, keeping the swaps to 6 per selected track, sometimes listening to the complete song, others just a snippet. All of my “serious” comparisons were against the stock cable, with casual swapping between the OFC, SPC and V-Moda cables later on. Setups used included an Asus laptop with either an HRT microSTREAMER or NuForce uDAC-3, Asus Windows tablet with the same and an Oppo BDP-103 through the headphone out of a T+A Power Plant.
 
The biggest difference, though still slight, was the SPC vs stock cable. On some tracks (not all, mind you) there was a bit more shimmer and sparkle in the highs. I could not detect a significant difference in the midrange or bass. Three tracks that really stood out to me were “Dead Already” from the American Beauty soundtrack, the title track from Ani DiFranco’s Up Up Up Up Up Up (both CD) and “The Ubiquitous Mr. Lovegrove” from the Dead Can Dance SACD Into the Labyrinth. These songs feature very well recorded and dynamic L/C/R percussion. With the SPC cable, aside from the aforementioned highs, the presentation took on a more holographic image with increased width, depth and height. I compared the two over and over because I was suspicious of what I heard (I am a bit of a cable pessimist) but it was there and it was very cool! I am sure if I delved deeper into my music collection, I could find more examples, but time did not permit.
 
Comparing the OFC and stock cable produced negligible, if any, results. The same goes for the cable from V-Moda.
 
When I purchased the X1s, I bought the V-Moda cable because that is what I thought I was supposed to do due to everything I read on this and other sites whilst researching. It was not quite a waste of money because I like the V-Moda cable better than the ones that came with my M-100s (it is longer and more pliant). It was only though careful and studious listening that I heard a difference between the SPC and stock cable. If I were to have the SPC on hand and plugged it in one day, I would not in any way be overwhelmed with “night and day” differences and/or improvements – I would simply sit down and enjoy myself. All in all, this was a very enjoyable experience, but this is not how I listen: I listen for the sheer pleasure that music brings, not gear. Yes, I want the best reproduction that my budget allows, but obsessing over kit is something I got over a long time ago.
 
Conclusions: (1) the “Philips Fidelio X1 Stock Cable Debacle” is way overblown (2) the supplied OFC and SPC cable were quite well made, really nice looking - especially the blue - and the connectors were very, very secure and tight; I started to worry that the jack into the X1 would fail because, well, I read somewhere that it could happen – I guess I have not learned my lesson and (3) the X1s are supremely fine headphones just the way they are – but I already knew that!

Update:
 
Those at the end of the list may be wondering why the tour seems to have stalled. We ran into a little hiccup and fell behind about 10 days. The tour is running quite a bit longer than I had imagined, but I'm everyone that wanted is getting a chance to try. 
Thanks for taking some time to share your impressions Funambulistic. 
 
 
Side Note:
 
Normally I don't build cables with solid core. I usually reserve it for interconnects or other purposes that stay mostly stationary, but I've decided to try a few experimental builds to satiate my curiosity and constant desire to experiment. I have plans to try two specific designs:
1. One based on the best possible sonic performance, but it will lack ergonomics (specifically flexibility). This will use the "air" dielectric idea.
2. A more open design mixed with cotton strands in a flexible/supporting formation. It will be thick, but allow for greater movement without the worry of breaking (hopefully). 
 
I want to see If there is a significant difference in sonic characteristics between the two dielectrics as well as formation of the cable.
An additional point is to see how durable the two designs will be. 
The final goal is to see how solid core OCC silver-plated copper (6N) compares to other wire types from a sonic stand point, generally. 
 
My usually advice is for people to completely avoid solid-core when making cables that they want to last. Since this is an experiment, I'm throwing that rule out of the window. This is a future thing and probably won't happen until next month. I'll make a post when/if that time comes for those that are interested. If I do a tour of those cables, it will likely be limited to a handful of people or less. 

Well, I've learned a number of lessons from this experience. Glad to all those that followed the rules and enjoyed the experience. 
I still wanted to send off the cables to a couple of you guys that participated. The last two guys on the list had to back out so we ended about a month ago. Sadly, the last person said they would send the cables (a month ago) and still hasn't responded since then.
Not sure why, and I could speculate all day but it's pointless. If he gets around to it in his busy schedule, I'll make sure to update.
Thanks again to all those that took part and kept within the appropriate time frames to be considerate to others.

kamakahah said:

  Well, I've learned a number of lessons from this experience. Glad to all those that followed the rules and enjoyed the experience. 
I still wanted to send off the cables to a couple of you guys that participated. The last two guys on the list had to back out so we ended about a month ago. Sadly, the last person said they would send the cables (a month ago) and still hasn't responded since then.
Not sure why, and I could speculate all day but it's pointless. If he gets around to it in his busy schedule, I'll make sure to update.
Thanks again to all those that took part and kept within the appropriate time frames to be considerate to others.

Click to expand...

I was looking forward to the end of the tour and the drawing for the cables...

I wanted to make a video tutorial for making cables now that I have some extra time.

Since I'm not sure we'll get the other two back, I might just use this opportunity to make a new one to give away.

This way someone can win one and pick their specs/style. TBC...

kamakahah said:

I wanted to make a video tutorial for making cables now that I have some extra time.

Since I'm not sure we'll get the other two back, I might just use this opportunity to make a new one to give away.

This way someone can win one and pick their specs/style. TBC...

Click to expand...

Hi, I want to thank you all who have posted impressions so far and especially to Kamakahah.

I was having a serious dilemma on which cable to get for my x1 worrying about the sound changes.

Now I'm just going to get one that is less bulky compare to the stock cable and throw the whole "cable with the best sound" thing behind and just enjoy my x1.

Thanks again!