I really suck at describing sound, but I'll give writing down my sentiments on the gear I tried at the meet a go...
Sennheiser HD25-II VS. Amperior VS. Momentum
One of the things I'm looking to add to my collection, is a second portable headphone. I currently own the Audio Technica ATH-ES10, which is great, but it has a few 'flaws' that prevent me from really using it as a portable. Simply put, it's just too pretty and damages too easily. The earcups are easy to scratch and with it's nice leathers I wouldn't want to get caught outside in the rain while wearing it, as it is too big to quickly stuff in a pocket to protect it from the environment. I've listened to the Sennheiser trio a few times now, but this was the first time I had them all in one room at the same time.
The Momentum
I love the momentum for it's comfort. The first time ever I put it on my head, I was convinced that Sennheiser has a replica of my head somewhere in their factory and that they used it as the main development platform for the Momentum. This thing just fits perfectly and the earpads are soooooooo soft...
But sound-wise it doesn't have much advantage over the other two. And I'm afraid it will suffer from ES10-syndrome... It is just too pretty, I'd be much to afraid to get it damaged or wet etc...
The Amperior
As it is pretty much an uprated version of the HD25-II, and the HD25 is a well known head-fi hype victim, I had quite high expectations of the Amperior. And yes, it does do a good job at reducing the mid issues the HD25 has. But do the aluminium earcups and slightly different soundsignature justify the €100+ premium over the HD25? I don't think so. If I didn't have to worry about money, yes, I'd go with the Amperior, but as long as I'm not in that luxury position, the added value is just too little.
The HD25-II
Is the winner of this little 3-way comparison. Yes, it has that little mids-mishap going on, but I'm pretty sure I can smooth that out a bit by giving it a similar treatment as my A500. But other than that, it pretty much suits my portable needs on all fronts. The split headband makes it quite comfy, it is rugged enough to just stuff in a coat pocket or toss in a bag when the situation calls for it and if anything breaks, all parts are available separately. So, if anyone wants to sell their HD25-II, let me know, I'll gladly buy second hand so I wont have to make the 1st scratch or nick on it myself
(Trans)portable DAC
Another thing I'm looking for is a new (Trans)portable USB DAC to lug into the office everyday. Previously I had my iBasso D2+ for this, but for some strange reason, it doesn't want to play with my Samsung Ultrabook.
I'd like a DAC/Amp combo-device, but I'm looking at other options too.
Stoner Acoustics UD100
One of the most impressive pieces of gear at the meet was IMHO Negakinus Stoner Acoustics UD100. It's tiny, it's cheap and it sounds pretty darn good. But as it doesn't have a casing, it might be a bit fragile for what I want to use it for. On the other hand, some el cheapo ebay USB device would make a decent donor for a casing. I'd still need a separate amp though. But other than that a fascinating device, a great example of good gear not having to be complex and/or expensive.
Fiio E10
Looks great on paper, it's cheap, has DAC & Amp in a tiny box, but I found it kind of underwhelming. Maybe it was the pairing with my ES10 that didn't work out very well, but as that is the headphone I'll be using it with most, I see no point in buying this.
Fiio E17
Now that's weird, from what I've read here on head-fi, the E10 and E17 should be quite similar. That was not my experience. While the E10 didn't do much for me, I did like the E17 quite a lot. But somehow the E17 isn't really that attractive to me. I can't really put my finger on why this is. It has a boatload of features, sounds good, is nicely priced, so what could be the issue? Maybe it is just that. All those features are nice to have, but I probably won't use half of them. Maybe it is just that I'd like my DAC/Amp to be simple. Just a box with some holes to put connectors in, a volume knob and a couple of switches for power and gain... On my wishlist, but near the bottom.
Odac (& Objective2 amp)
Screw it, I want this... Both together in one box. All I'm wondering about is why the combo version is more expensive as buying them separately. I mean, if they save the expense of a 2nd enclosure & some batteries etc, shouldn't the combo version be cheaper than the separate components? Or is it really that difficult to hook 'em up to eachother and stuff them both in one box?
IEMs
UE 900
While I loved the UE900 for its technical aspects, it's sound signature didn't really match my taste. This made it pretty meh for me on most of my test tracks, but the ones I did like it for, boy did it excel at those... I think I need some more time with these for a better verdict.
JVC HA-FX700
The FX700 was quite warmish... As in skinnydipping in lava warmish. The bass on these is nearly absurd... Deep & clear but not lacking punch. With one of my more bass heavy test tracks, it kind of freaked my brain out, as in "What's going on??? Why is there no pressure on the chest while the eardrums register so much bass???".
Fisher FA-3
I really liked these, to quote Ultrazino: "it just delivers music - nothing else. What else do you need?!".
Vsonic GR07 mkII
Did a A-B together with Sepinho between his GR07 mkII and my GR04 T.I.E.M.F.K.A.F.E. (The In Ear Monitor Formerly Known As Flagship Edition). Sound-wise, the GR07 was the clear winner here, better lows and it did seem to do everything so much more effortless than the GR04. That being said, the GR04 isn't bad, it's pretty damn hard to beat its value for money. I'd say it delivers about 80% of the SQ at 30% of the money, which in my book isn't a bad deal at all...
Full size cans
Brainwavz HM5 (or was it one of the other rebrands?)
Nothing special sound-wise, but
holy clampingforce Batman!
Sennheiser HD650
I understand what all the fuss is about now (I was still a HD650-virgin). The only thing I didn't like about them was that the 'Sennheiser sound' was a bit too much present. I wish they toned that down by about 15-20%,
AKG Q701 (white version) VS. K702
Did a quick comparison on these 2. The K702 was much, much darker than the white Q701... In colour that is.... I really couldn't hear much of a difference between the 2. One thing I've learned from this comparison is to never hire Quincy Jones to tune the sound of my gear. It appears the man is a serious slacker...
Philips Fidelio X1
Only had a very short listen, but it was good. Good enough to make me consider buuying Philips headphones again. Something I haven't done since the SHE-9500 unchained a deep festering hate against the brand years ago.
High end cans
One of the things so great about these meets is that you get to try equipment that you'll never be able to afford unless you start selling organs, your soul or firstborn child. Yes, I'm talking about you Audeze & Hifiman... Like I said, I'm not very good at describing sound. So I'll just say that one of the Hifimans (was it the 500 or the 6? can't remember, it was kind of emotional) on the Darkvoice amp nearly had me in tears and the LCD-3 on a Burson amp nearly made me shat my pants and leave it at that...
A couple of pictures

Just a little overview

Negakinus' Hamper o' headphones...

The stuff I brought

Tilpos' Stax

Good to see at least someone dared to bring some vinyl

Another one I didn't get to try: the Schiit Lyr
More to come.....