In reply to mark_wellin:
Hi Mark,
I'm with you on this, I wasn't sure what to expect either, but had the chance to play around with one for an hour or two at a press event last month.
Although I would very much have liked longer time-wise (and I'm sure we will get the chance as soon as one is available for review), my initial impression was how easy it was to use. There's no thumb catches, no triggers to pull/push, just a device very much like a standard belay plate, but with the added benefit of the inertia reel assistance.
Another thing that was noticeable, which wasn't something I was expecting, was that it was remarkably easy to pay out slack with - perfect for those quick-clipping belays on redpoint. I thought it would catch in much the same way a seatbelt does when you pull it out too fast, but they seem to have got something right there. Lowering was also a very smooth action due to the fact it's moving round quite a large pulley (if that's the correct word?).
Either way, I'll offer more thorough feedback as/when I've had a chance to give one a hammering!