I have been using one of their covers for my 2015 Seneca 37 RB since 2016 . Up here in the great white FROZEN north it has kept my roof and unit safe from all the freeze and thaw cycles we get. While it is a heavy unit to get up on roof it is well worth it in my books. I think the only thing better would be a solid roof over unit but I’m limited to space by my house . 👍