I have been a religious mohair user for a long time. I just bought my first alpaca cinch (its the same roper style you have linked except its Weaver brand) and so far so good! It was only a few dollars more than the mohair (they were out of the mohair size I needed). I've had it about six months, I ride with it 3-4 times a week for 1-2 hour rides at a time. No galling, and it still looks almost new! I rinse the sweat and dirt out of it once a week or so. I'm pretty happy with it, and it almost seems softer than the mohair even. I'd say you can't go wrong with either.