I highly recommend one. And it's currently on sale! I originally got the base 64gb one but then spent 18$ on a 256gb nvme drive and upgraded it. Cheaper than buying the 256gb direct.
It's way more than just an emulator for me too. I've been playing a ton of triple a games like diablo 4 on it, I even used it as a desktop replacement for a bit while I was moving and it did fantastic
I mainly used it to play emulated ps1 titles and a ton of Jrpgs. Star ocean 1 remake and star ocean 2, tales of phantasia, castlevania SOTN, xenigears, the list goes on. Even had a really good snes emulate I was able to sneak on there somehow and was a great portable snes machine.....just like my steam deck is now. How things change yet stay the same.
Just did mine tonight. Just shy of 10y by maybe a week, been getting ready for the switch for weeks. Browsed right up to the end, deleted, and no looking back
When I upgraded my SSD in my old 64gb model to just a 256gb, I had to reinstall all my games from scratch, including D4. Nothing would work otherwise that I had on my old SD card. After that I had no problems. When I get back from a concert this evening I can look and see what version of proton my D4 is running so that I can say with certainty that it is working and let you know