The main issue with the Schiit gear, IMO, is the fixed Gain (5x). That's too much for a lot of listening scenarios. While it should be great for less-efficient headphones, you'll need to cut source volume to use it with more efficient phones and common music. Anyway, the extra power will be great if you end up going with some power-hungry orthos or high impedance phones in the future. But for most low-impedance phones, its likely a bit of overkill sorta like the O2.
I was interested in the Schiit until I realized that the O2/ODAC wins with its selectable gain, 3.5mm jacks (instead of RCAs), and stellar sound quality was overall a better fit for my typical listening needs.