I acquired my Faders Variable Belay from Climb Max in 1999.
The Faders Variable Belay is forged from aluminum alloy and then hard anodized. Each slot is 29 mm. long and 14 mm. wide. The slots have an hour-glass shape, but this is of no functional significance. Mine is 45 mm. long, 58 mm. wide, 23 mm. high, and weighs 64 g.
There are no markings on my Variable Belay other than a sticker added by the retailer.
The Faders Variable Belay works much like any other slotted belay device. The control is good, but not as smooth as some of the belay tubes. Like the Wild Country Variable Controller, the two ends are asymmetrical, so it can be reversed for a slight change in feel. The asymmetry is less than on the Variable Controller, and I don't find the difference between the two orientations to be very great.
The cable keeper is nice, and helps prevent dropping the device while at a hanging belay.