In reply to Firestarter:
I had one and used it for about a year. It works reasonably well. However, it tended to lock up too easily when paying out rope, and when using twin/half ropes, the ropes had a tendency to migrate under the separator piece and get hung up.
I recently switched to the Climbing Technology Alpine Up. Quite a bit more expensive than the Alpine Smart, but superior in just about every way. Much smoother paying out rope. Much smoother rappelling. Less effort in guide mode. No issues with ropes getting hung up. Only negatives are price and bulk.