Zap door openers

[wstephens1249]

Zap door openers! Does anyone out there have any experience with them? Any comments or concerns on the design? One thing that concerns me is that its just pulleys and a belt, seems like it could have slip issues. Other thatn that is seems pretty simple to me, would be installed on a 12'x12' dead shaft roll up. This is the one I'm considering.

https://www.northshorecommercialdoor.com/zapmo815rgmi.html