Ammon Hatch wrote a review of Petzl Verso Belay Device on December 9, 2009
I bought this as a spare belay device to loan out (I use a first generation reverso usually), but since then I've started using this every time I don't plan on needing to autoblock. It's light and smooth, but has plenty of friction when the time to lock off comes.
If I'm belaying a second (or anyone) from the top, I'll want an autoblock. Otherwise I'll save the weight and use this device.