I know it got a lot of hate at the time, and much of it well deserved, but for many games I think the steam controller was one of the best.

I quite enjoyed mine for Rocket League back in the day, the remappable controls were quite nice.

Currently I use a SCUF DS4 for my Linux gaming and while I love the Controller in theory, the inability to remap the paddles to a custom button chord instead of just a button that's already on the controller is frustrating.

Steam Controller 2 is on my must buy list.