Review (4/5): About what you'd expect with better than average customer service
These are pretty much what you'd expect. They aren't as flexible as some. I can't say that I'm overly impressed with the quality, since the ends have popped off a couple of them while I was folding them up. They did go right back on, but it's not the sort of thing you expect the first couple of times you use something.
The good news is that there are plenty of them.
Edit 1 September 2016
Since posting this I have heard from the customer service department with help for the issues I had with the rollers. I wanted to publicly thank them for this. For anyone with questions, don't hesitate to email them. They are really much better than the average out there. To me, that's important.