So I just got the Fulla Schiit.
I've been using it for about 15 minutes now and I am really surprised by the difference in sound. I've been reading how DAC/Amps only make a slight difference, which is true, but that subtle change in sound makes a big difference. Everything feels crisp, the bass is tighter, the soundstage is wider but there still is that M100 warm audio signature. I feel like just closing my eyes and just listening to every track possible.
The Fulla appears to suit the V-Moda's sound quite well. Note that slow beat music, like chillstep, some house etc have major improvements IMO. Drum&Bass doesn't really sound much better, trance has a slightly clearer sound. Nu-metal seems to have a good improvement as well..
Overall seems like a solid $100 purchase for the M100s.