Got mine today. I've downloaded and installed 13 games. It has crashed and rebooted 5-6 times in fewer hours of use. The hardware is very nice, and it feels good in the hands, but if the game isn't listed as verified, you are lucky to get past the game's start menu. It's like using a pre-honeycomb Android Tablet. It's got tons of potential, but it's still a hot mess. I'm going to wait until after the weekend before I truly judge it. Right now, I believe many youtubers are understating the poor game compatibility
#Update#
My unit has been crashing like crazy. Any game that was incompatible would lock up the entire device. It even occurred with at least 4 Verified games. A few times, I would hear the unit reboot just sitting there downloading games. So I contacted Valve for an RMA. When it works it's a game changing device. So I definitely want a replacement and not a refund.