Ive had my 365 cover for several months now. I try to bring the scope (a 6-inch refractor on a CGE mount) inside if the weather is threatening, but there are times when I dont quite and the weather swoops in. Thus, the 365 has been tested quite a few times now by Flagstaff monsoon rains and wind. Im quite happy to say not a drop has ever reached the scope or upper tripod or tripod electronics column. In addition, during contiguous hours of direct summer sun, the dark blue scope tube (which would normally get hot to the touch) under the cover warms only slightly, so thermal protection is therefore also quite good. My only wish is that the bottom of the cover extended further towards the ground to protect more of the tripod legs. Highly recommended! A bit expensive, but definitely worth the cost.