I use the 3/8" impact swivel sockets pretty often. The only issue with them is that they won't give you as much of an angle as a standard universal style swivel socket. In reality, though they don't bind, if you just use a universal at the same angle, it probably wouldn't bind too much, either. Universals generally bind for me when I try to use them at a crazy angle. I just have a swivel adapter for 1/2" impact sockets, but I haven't found that I have as much trouble with access with the big fasteners. The smaller fasteners seem to be the ones tucked away where you can't get to them. That's why I think the 3/8" swivels are more useful than the 1/2".