I will give you a 100% positive review on OTC. I think this is the 8th winter I've used mine on a John Deere 2320 and it's still in perfect condition. I put mine on in the fall and take it back off in the spring and I store the tractor inside. Once it's put together, the frame is quite rigid and it's pretty easy to install. I did get the optional glass windshield and would recommend it, but the side and back plastic windows on mine are in good condition after 8 years.
With the hardtop, I found it easy to install LED spotlights high front and rear which make night operation very easy.