I always wanted to try them ever since I saw them in the InnerFidelity Wall of Fame for portable amps
http://www.innerfidelity.com/content/innerfidelitys-wall-fame-headphone-amplifiers
That said, I have the newer iFi Mico iDSD, very well review portable dual DAC & amp combo that is price comparably to the M8. I feel it would be a side grade if I buy it.
The iDSD does nothing to tame the painful treble spike & harshness of the Beyer T1 (pairs fantastically with the LCD2 though).
I used the iDSD with a Schiit Asgard 2, which is a warmer amp & did lower the peaks & shrill sounds of the T1, but not close to fully taming them.
I'm convinced after having the Micro iDSD, that I would need a stronger desktop amp than something that is available in a portable package to fix the problems.
Just looking for an amp or dac that can 100% smooth out any painful, harsh, treble spikes & sibilance of the HD800 (and T1 by extension), while not affecting or congesting the soundstage/imaging. If anything, I want the amp to expand the holographic sound!
If there was a solid state portable amp that can do that & still be under $1,000, I would jump on it in a second!