Not OP, I recently got a steam deck to play Silksong, so I haven't used it for long, and only for two games, Portal and Silksong. It's been great for me so far, just took some getting used to. Definitely getting Hades II after I finish Silksong.
Because I have small hands, reaching the shoulder bumpers is hard, so I have those mapped to the back buttons. Reaching the right joystick was a bit hard at first but I got used to it.
It's more comfortable than my Switch, and for playing long sessions, surprisingly more comfortable than my dualshock too, where I often strain my left thumb.