I have owned a Hewbolt double for a year. I use it mainly for multi pitch and sport climbing. I also use it to set routes. Within first few months the device showed dramatic wear on the rub parts of the device including the screw in axel.

Feeding rope with the Hewbolt double is difficult with older thicker ropes. Thinner ropes are easier to feed but don't lock down as well. When compared to belay devices like the gri gri the Hewbolt is much more difficult to feed.

Using the Hewbolt on multi pitch is nice because you can have an auto locker that can be used under control as a rapel divice.

My main concern with the Hewbolt is that for as expensive as it is the thing should feed easy and last a long time.