I’ve been gaming 100% on steam controller for the last three-ish years; I don’t think I can ever go back to keyboard & mouse.
Plusses:
- Input is surprisingly precise due to the touch pads—and if you’re a fps player, touch pad + gyro is insanely precise.
- So many buttons you won’t know what to do with yourself (I used to play WoW with it; even end-game raiding and PvP)
- You can do some pretty neat things with it (chorded binds, overlays, etc)
Minuses:
- It will take you weeks to get used to it, and feel effective at it.
- So many buttons you won’t know what to do with yourself (configuring a new game can be a huge time sink if there are not any great community configs available yet)
- For chatting, you’ll still want a wireless keyboard (the on screen keyboard is pretty good, but still not fast enough)
FWIW, I’ve published a very thorough controller config for Boundless that I’d encourage you to check out, if you do end up trying it out: Updated Steam Controller Layout