My husband and I are considering buying a Duramax 8X10 vinyl shed over the internet. According to the company description,it sounds durable but we have not been able to find a model at local stores to look at in person. Has anyone purchased these sheds before? Were you happy with the quality? Does it last for 15 years and withstand strong winds? Are the walls of double thickness? Does the color fade or change over time? Any other comments or suggestions?