Well, I run a QA1 which is basically a UPR or whatever tubular. I beat the hell out of mine in the corners and it's held up fine. If you search the web, you will find good/bad reviews for them in that purpose. But then again, there are tons of people who don't post up about the positively. Most people who post about a product are negative.
I would run their complete setup on my car aside from UPR/QA1 coilovers.