I have a CalMark cover and like it a lot. The zippered door access is a big help. While I use the straps, I've found that using the cinch rope around the bottom causes water to collect in the pockets that get formed, so I don't tighten it around the bottom that way. It "billows" a little in the wind, but I figure that's actually a good thing. I use foam insulation ((3/4" size) around the solar panels sharp edges. The panel maintains a charge through the cover.
2009 Tacoma Crew Cab, TRD 4WD
2007 Tundra Double Cab TRD 4WD
2014 Escape 19
2007 Norwegian Elkhound "Baxter"