Arrived and fired it up - 512 GB model with a pretty sweet case. I love it so far. There are quite a few games as confirmed to work well with the Steam Deck and a number of them are flagged with seemingly minor issues (having to use the pop up keyboard occasionally, etc.)Expecting mine to come in today. I'm almost in disbelief this is really happening.
I broke it in with The Orange Box package and played through the first hour or so of Half Life 2. It really is an amazing experience.