The main reason to get a leather strap for me is that the friction of the rough side sticks to your shirt, but there is no rough side to this strap! The underside feels like it's made from some type of rubber, and it was very grippy when new, but within half a year the rubberiness was gone, and now it's pretty much equal with a nylon strap. Not so good with a neck diving guitar.
The material is soft and feels very comfortable, and though the stitching is somewhat haphazard, it doesn't really have any effect on the usability of this strap. The button holes are pretty tight have kept their shape well, so I haven't needed any sort of locks.
It's an okay strap but I guess I wouldn't buy it again.