Honestly the steam controller is just absolutely amazing for AAC. It works just... so damn well.
Not super fond of it's default button placement on things tho, it's really, REALLY weird hitting what would be X or B (actually A on the steam controller) on ps4/Switch/Xbox pads, and having THAT select things, instead of B. whichi s actually A on the Steam Controller. it... it really throws me off something fierce.
like "hey press B to go back" okay then *presses A* "shit"