I can't recommend the Schitt Fulla over the Cayin C5, but I can comment that the Cayin C5 powers the DT770-80 easily. Listening with and with the Cayin C5 on my Samsung S5 is more enjoyable with the Cayin C5 because the mids and lower frequencies have more snap. On the S5, volume is about 80-90% whereas on the Cayin C5,low gain is enough. I really like the Bass Boost as well for two reasons. At low volumes, the DT770-80 highs are very present but I feel the lower frequencies lag in volume a bit so with bass boost, listening at low volumes is more enjoyable. The second reason is that the DT770 lower mids sound clean to me so when you use the Cayin C5 bass boost, you don't end up with a bloated mess in the upper bass, lower mid area. The DT770-80 responds well to the boost on the C5. What's nice is that with the flip of a switch, if a song is already too bass heavy, you can cut it instantly. I was ok happy with the DT770-80 initially, then a little disappointed after hearing a V Moda M100 at first but I felt there was too much emphasis and congestion in the M100 with bass bleed into the mids, yet I wanted that punch in the DT770-80. When I recently got the Cayin C5, it fixed that problem and is not overboard (for me). I get the soundstage, clean mids and now more thump/impact in the DT770-80. It also boost that sub-bass so you gain more extension down low. I don't think I can travel or listen to my DT770-80 workout the C5 now unless I'm on my desktop unit. My desktop dac/amp is an m9XX and typically I listen to other cans, not that the DT770-80 isn't optimal here. My 2 cents.