At just under an ounce you won't find a lighter belay device. The Bugette is perfect for glacier travel and other just-in-case applications. For heavy and/or frequent use you'll want something with a bit more metal to dissipate heat more efficiently.
This little fella has nice touches such as smooth edges and a covered keeper cable, and is designed to work with ropes from 7.5mm to 9.5mm. In practice it's a smooth operator, and you'll barely know it's there until you need it.