Belay Devices
The one device to rule them all. Every climber must have one of these (a two tube guide mode device).
Pros: Does everything possible. Cheap, burly.
Cons: It is not dummy proof.
It belongs to a category of devices called passive assisted braking tube style belay devices. Giga Jul is the newest and the most intuitive in that category.
Pros: Provides assisted braking, hence easier to catch falls and rappel without a backup hitch.
Cons: In the words of my mentor "Giga Jul is a brilliant device, but it can also kill you. It is an advance piece of equipment that need one to be highly conscious at all times."
As usual a great review by Outdoor Gear Lab.
Karo is a very light weight single tub style belay device. It has an interesting design that makes locking off easy. Available in India.
Pros: Very light weight and small in size.
Cons: Single tube.