Have the clear 14-mil version. A month in, and I've been pretty happy. Installed in April, and within a week, the water temperature had risen 10 degrees, in SoCal (from 70 to 80). We do get lots of sun, and this was the first time we had ever swum in April in our pool. After another 70-degree week in May, we're up to 87. Without the cover, we certainly wouldn't have gained more than 5 degrees in the same span - we'd always loose a lot of heat in the cool nights.We have a kidney shaped pool, and it was fairly easy to stretch across the pool, draw the edge with a sharpie, and cut to size with scissors. I've left a few inches extra on all sides so that it wraps up the edge of the pool tiles, and leaves some flexibility when aligned it back to fit each time. Never have had trouble with wind blowing it away. But if you leave the edges long and curled up, rain water collects on top rather than flowing into the pool.Removal is a little tricky, but it can be rolled long-ways, and then rolled again into a manageable cylinder. It's not heavy to lift. It feels very sturdy, dragging it along our concrete. After some practice, typically 5-7 minutes to remove and reinstall, just 1 person. 2 people certainly make it simpler. A rectangular pool would also be easier.The warmth is nice, and we also haven't had any evaporation - so no pool refilling yet. I almost think it'll be too good: I don't want the water 90 degrees, but I do want to avoid evaporation in the summer.