I don't know of anyone who uses the multiple discs. It is true that over time, the little blue bubbles do disintegrate and I don't think it matters too much how much you pay for the solar cover, either. I typically don't get more than 2 maybe 3 max years out of my covers. They are best at keeping heat in the pool and preventing evaporation more than heating the water although you gain a little heat. If you can pair it with a solar heater, it makes a huge difference!
If you are trying to search for other threads discussing solar covers, use the google search link in my signature below instead of the search function on the forum software and you'll have much better look at getting good search results.
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