Futura Hand Right

It is more comfortable than your standard hand ascender as it is quite ergonomic. 
 

The issues are that the ascender isnt necessary designed for rock climbing since there is no finger protection. Slilding the ascender up against rock can mash your knuckles, and if not that, the bottom portion bulbs out which can get caught on edges. This lack of finger protection also means there is no loop for your fingers when detaching this from the rope leading to a higher chance of dropping it if not tethered. The detaching motion also takes a little getting used to.