The company I am working for has purchased 5 subscription licenses for the Telerik control suite on my recommendation.
I'm pleased to give an initial impression that the controls are stable, easy to work with, and cross browser compatible. I'm quite impressed with their controls and would recommend them.
If all you coders out there in blog reader land would like me to do a series on the controls with code examples I'd be happy to provide it, but I want it to be requested since they are 3rd party controls and the series probably wouldn't be of interest to many of you. If there is enough demand I'll do it though.