I have a large GB adze, and I like it. I would class it as a good all rounder, great for wasting wood from a bowl and great for sculptural work. The problem I have is the handle. For some sculpting work it is too short and that bloody chunky fawns foot on the end, a hand wrecker. They have just stuck an axe handle onto it.
Working with wood on the ground and swinging the axe through the legs means that I am bending over way too much. Holding below the pommel means that I have to bend over even more. The adze is fine if you are working vertically or on raised work as the hand is below the pommel. One day I will put a slightly longer handle onto it, too long and it will change the arc the head swings through, and it will not cut as fluently and the bevel will need to be reground. A longer handle will also help with my back issues.