RS is great. My wife runs a fashion blog and it's the best affiliate platform out there right now. It makes monetizing your links a cinch.

However, I have had problems with performance. I think they are just struggling to keep up with the growing scale. Resolving redirects through bit.ly to rstyle to finally the product can be very slow at times. And their image widgets are also pretty slow. I think they need to improve their CDNs. And iOS app is pretty buggy.