I have the 6.25' bed and the GF and I sleep under the Softopper when camping pretty comfortably. We put the guest futon mattress in the bed, fold it in half and strap it down and pack the camping gear next to it. When it's time to sleep we unfold the mattress. When I'm not camping or hunting or storing stuff in it that needs to stay dry, I keep it folded down, which it most of the time. While the topper looks cool, I think an open truck bed looks a little cooler, plus there are no windows in it so changing lanes and backing is a bit harder with it up. One con is the mounting rails prevent one from sitting on the bed rails when tailgaiting or hanging out on a bird hunt, or after a hike or whatever.
I've slept in it a few times in heavy rain and did not get wet. That said, the little straps that hold the side panels when they are rolled up, do wick water if they are not heavily seam sealed. USE GEARAID SEAMGRIP (formally McNett Seamgrip) TO SEAL THE SEAMS! The crap they give you is weaksauce. I spread the topper inside out on the floor and sealed it and left it for a day. You may need two tubes, but I made it work with one, barely. I haven't had any other issues in wet weather except for straps wicking little drips of water. The topper has not seen any snow (the snow likes to stay in the mountains, not down in the Owen's Valley).
The rails like to move/bend inward a bit when the cover is on and tightened down. This smooshes the foam weather stripping around and mine is off center and doesn't look great. Minor gripe. I can always replace with better stuff.
Buy the optional cover for storage! When it's folded up and still on the truck it can get pretty dusty, and will hold rain in the folds and get real nasty. The cover is great.
I elected not to stick the velcro to the tailgate and just let the back window hang. The soft velcro on the window panel has made rub marks in the paint there, from moving against the tailgate. This is right above the handle. I don't mind so much, and I think it's better than sticky velcro strips, but it could be a concern. I have been meaning to sew in magnets to the bottom of the window panel to keep it in place better, but haven't gotten to it.
The biggest gripe for me, which is a problem in my area due to the soft poofter dust on many of our dirt roads, is dust in the bed! When the topper is fully deployed and all snapped and zipped down, there are still little gaps at the corners that allow dust to come up and in the bed. Since there is no air flow into the bed, the dust/sand just settles on our futon or whatever and it can get pretty thick. I think rolling up the sides and back window when driving in soft dirt would allow the dust to blow through, but I haven't tested that yet.
Otherwise it's the BEST solution for a person like me who wants a truck for truck stuff like tailgating and hauling brush and wood and recycling and furniture, but also bed camps and lounges under the canopy for naps when fishing, etc. Awesome, versatile product overall and at a good price.
Sorry to spam your thread with pictures of my truck! This if YOUR build thread, not mine and I'm happy to delete them!!