I purchased a twightlight series in June of 2015. By September my cover had already dipped in causing water to build.
I contacted the dealer by email. In October I was told my cover would be replaced. It is now May 2016 and no response from email.
I had a Marquee and my cover lasted 12 years. At this point I am sorry I didn't go with a local dealer instead of a hot tub show.