Performance largely equates to:
CPU- Roughly between an Ryzen 3600 non-x and 5600X
GPU- Roughly between an Arc 570 and 580, or about 20% behind the "proper" desktop AMD RX7600 in most cases
There are outliers, of course.
Gamers Nexus had a number of complaints about some messy OS issues (lots of SteamDeck UI remnants and autodetects), and oddities like some games defaulting to Linux versions rather than play the Windows version through Proton (which, in many cases, offered better performance). A not-insignificant number of games remain unplayable due to anti-cheat issues.
They do stress that, given the state of the DIY PC market, it's not egregiously overpriced. That said, Valve has said that, due to shortages, some machines may ship with 2 8GB sticks of RAM, OR, 1 16GB RAM stick. It's not clear how significant the impact that will make in gaming.
Also, DBrand is making custom "Companion Cube" enclosure.
LTT has a more condensed take, but hits many of the same points Gamers Nexus brought up. And good context to the pricing and console comparison
