CaptMatt, your skepticism may be well-founded, to a certain extent. I have purchased lines from them on three occasions. All but once I was completely satisfied. One of the lines I received seems very heavy at the end, like the taper wasn't sufficient. It handles nymphing OK, but for a delicate presentation, frankly, it sucks. It was supposed to be a 5 weight, but feels more like a 6-7 weight. Luckily, My rods are fast or medium-fast action.
For me, the bottom line is, they cost $8.50 delivered. If you are short on cash or just (or also) a cheapskate, it is worth the risk.
If you spend $60 on a top of the line fly line and it seems off balance or slightly irregular, you have a right to send it back and should expect to get it replaced. If you chance it with one of these, you either put up with the deficiencies or you just wasted $8.50, about the cost of a movie.