Smart really is a smart belay device. It locks automatically both when belaying above as well as belay and offers pretty precise control over the rope. Furthermore the locking action feels very secure especially when belaying from above. Unlike Grigri and most other auto locking belay devices Smart doesn't have many moving parts, thus making it suitable also for icy conditions. The auto locking mechanism works also on rappels and the control over the rope seems precise also ther (this being said, instructions say that one should use prusik backup in any case). Compared to other tube type belay devices Smart is significantly heavier than for instance Reverso 4, however compared to auto locking devices such as reverso it's ligth. One con perhaps would be the fact that Smart is pretty sensitive to rope thickness. As a result you may need two different versions of it, if your rope range varies heavily. Stíll Smart was a really positive surprise.

Review...

The new Mammut Eiger extreme collection's flagship is the Nordwand tandem - jacket and pants.
Comparison to the earlier Mammut extreme hardshells reveals daring changes:
Revised colours, much brighter and fresh.
Lighter materials
Thought-out details
Separate range for women

In use, the jacket preforms well, and proves to be tougher than expected, given it's weight. Stretch proshell enhances comfort. There are re-sizable hood and collar, removable snow skirt, 3 pockets outside, 3 pockets inside.
A functional and solid, comfortable piece of winter protection.

I have used the sample kit the whole winter 2011, in Norway and in the Alps, lots of ice climbing and mountaineering. It's still in good condition, awaiting the next season eagerly :-)