I too would like to say that getting a solar cover has been a worthwhile purchase for my little 18foot round pool. I really like to have the water warm, and with the midwest heat that we have been having lately and abundance of sunshine, my pool has been sitting at a spa like 100 degrees for the last week now. I am just using a blue cheapie that I got for 60 dollars, I notice that after a good 4 - 5 hours of sunshine, the water in the first foot or so really heats up, so I have my pump filter set to go from 11:30am - 12:30pm, then again at 5:30pm - 12:00am so I can circulate as much warm water as possible. Last season without the cover the warmest the pool ever got was 82 degrees, and this was with a few straight weeks of 100+ degree temps! Other advantages include the amount of chlorine the pool needs has greatly reduced, and loss of water due to evaporation is also greatly reduced.