Daniel Johnston
Headphoneus Supremus
I'm considering a Mojo 2 because of the price.
Am I correct in assuming it will sound very different from something like a SMSL D400 or Topping D70?
Likely yes, but may not be as large of difference between the high SINAD negative feedback DS designs (Topping/SMSL) as you may think. It depends of what music you prefer, your amp, your transducers, etc...
You buy the mojo2 for the portability, UHD EQ, and on-board crossfeed. You certainly won't be disappointed with Mojo2 performance as a DAC either.