I've had two Clearview's on my RSTD's, both with vent. They are great, love the recurve top. They kept their "clear view" better than stock.
But I got a F4 Customs for my RSV. The first one came from a bad batch of plexiglass. After time it seemed to frackle. Talked to owner, as I was out of warranty, he let me have a replacement at half price. Fair.
It is even more bullet proof that the Clearview. Still up in the barn somewhere, took it off before I sold the RSV back to a dealer.
It was good enough that when I got rid of the RSV and got a used Goldwing Trike, first thing I did was order a F4 Customs for the GW. Six years and still looks new. And you clean it with Windex and paper towles. Don't do that with the Clearview.