I have a hand-me-down from a friend, it's pretty nice but I hardly ever use it in handheld mode which is where it really shines. I use it docked with a kbm+monitor setup. I am using a 4k monitor that I found for free in a Walmart, but I don't know if it was the optimal choice. The Steam Deck was really only ever intended to play games at 720p or 1080p so I ended up lowering my resolution a pretty large amount just to maintain 30fps in more modern games.
I like it overall though. It runs everything I need to run at a fine enough level and using it has taught me a lot about Linux, it's a very fun computer. I don't know if I would pay for it personally because I'm broke as fuck but I appreciate owning it.
:)