Presto is now available in Beta (and has been for a short while). I was curious to know if anyone is using it. I just installed it on one of my older Dells(Latitude D600) in about 5 minutes and rebooted right into it. It was completely up in about 30 seconds.
The GUI is simple, with a sidebar for your web browser (Firefox preinstalled), an IM client (haven't configured it yet), Skype, a File Explorer, and a link to an Application launcher, which includes their Application store.
It found all of my hardware instantly (touchpad, CD/DVD, network). I was impressed that it found my wireless network immediately and asked for my key. Sound worked, and the video resolution is correct.
As I type, I notice the built-in spellchecker, which I missed when I had to leave my MacBook Pro behind. It supports the standard right-click/correct, and custom dictionary.
I've had it on for about 20 minutes browsing, and it is pretty quick and light. I haven't explored any settings, nor do I even know where they are inside the OS. I'm certainly a GUI guy, not a command-line warrior. Maybe one day when no one runs Windoze.