Dedicate amp should be awesome but one thing that I like about X or Typhoon is the portability. It's easily fit in my pocket. DD + C5 is a bit too big for my jean. Need to put that in my sweatshirt pocket. I think the only concern to them for making dedicate amp is competition from other companies. There are many amps out their.
True but they know their DD socket 1 better than any other company and it should not be hard to design an amp that best suits their own gear. My only concern with SounDroid is the 10 ohm out put, honestly if they could reduce that and increase the power to 120mw there is no single unit out there right now that can challenge it.
The only other gear that I can think of right now is CEntrance.