I've never used them before neither, but heard nothing but good things about them. If you have a twitter account, you can follow them. They issue codes on a regular basis for 40% off their weekly rental prices and seen it for the 70-200 all the time.
They're local to me and are awesome. I've never used them but almost everyone I've worked with has used them, and I've never heard a single complaint. I follow them on Facebook and whoever updates their page has a total sense of humor. :biggrin: