This is a good bang for the buck. It works well and is built solid. It does lack a little in adjustability when compared to most ghd's. It works well for me with me being 5' 11" tall but not so well with shorter people. My daughter who is 5' 1" struggles trying to us it.
All in all a pretty good machine. The calf block is a little small which causes a shorten range of motion. I usually just use the cross brace for full range of motion calf raises. The bearings are a little loud but seem fairly smooth. The leg presspress/hack squat work well and give me a full range of motion with me being 5' 11" tall.
This one is probably over kill. The mount is built like a tank but the bowl could use an upgrade in quality as to match. All in all a nice add on that I'd recommend.