I've been posting some experiences but over in the other GO 1000 thread. It is taking me time to sneak in different combos to try and on Mac/PC with different things on the USB bus. Found that running a USB hard drive while running the geek was probably taxing my little 11" MacBook Air too much. It was causing clicks/pops and possibly starving the unit a bit. Now I am using with PC and local files to try and stabilize the system for testing with phones for sound.
Geek Out 1000 with HD600 on the PC is a rocking combo. The 600s handle the mids well while the sabre DAC treble adds some top end air/detail and actually makes the 600s bassy too. Smiley curve HD600? Fun. Bordering on too much bass for me, LOL. The headstage is noticeably bigger than when I use iPhone 4S to Leckerton 6S Mk.II, especially with the 3D on. Great transportable rig. I'm also going to try the 450 with the HD600 and see if there are any differences...
So far, I really dig the GO 1000 with HD800 for classical music (I keep gravitating to that and exploring the collection when I have them on) but that was on my MacBook Air. Need to try again on the bigger PC or with off-board power to see if the tonal tilt changes. On the Air, the balance with HD800 was too bright at times with rock/pop/bright recordings.
It's a slower process for me to run through combos these days. Over time we'll be figuring out how these sound best. Posting these ongoing impressions to try and add some sound impressions to these threads.
With UERM, I have had some varying experiences with 1000 and 450 sounding <just different> or <preferable> to each other or the <same>. So I need to keep trying but will do so now on the bigger PC.
I do appreciate the setup talk too though, because we are all going through it. I have a port on the back of my PC that I like to run the geek out of, but if I try to turn the 3D off/on, the battery pack gets in the way and I end up messing with the physical volume controls and resetting the volume to ear-blasting level. So we're all getting used to the implementation. I prefer the system volume control if possible because the internal Geek control is slow to adjust in very small increments. Any improvements for turning the 3D on/off or having the unit reset to zero instead of full may be welcome. I feel the unit gets warm but that in no way has been a bother for me. The heatsink setup looks very cool though (pun intended).