I am on my second Adco cover from CW. I am a believer. Bought the 3 year warranty. The cover developed some tears at the tie dows during a 45 mph wind storm. CW replaced it, and I bought another 3 year warranty. Just be sure to save your proof of purchase and, most important, get the registration of the cover purchase done. I had trouble accessing the registration, but they did a credit card search and we found it. I am in the wet part of WA, have not had any mold or mildew with the cover. I put a couple Dri-Z-air dehimidifiers inside the door and I empty about 3 cups of water out each month. The only place I have had any dirt/mold problems has been on the propane bottle cover (it is not under the cover).