First of all, If I used this cover for outdoor storage, I probably would not rate it this high.  The time I used it outside and it rained, it was not waterproof.  Now, that said, the cover makes an excellent indoor/garage dust cover.  I just replaced mine after 10 years of indoor use on my Z3 Roadster.  Not a bad deal at less than $3 per year.  It keeps the dust off the car nicely as it often sits for extended times and is really just a weekend car for me.  The cover is soft and fits very well, and if you use your car and cover like I do, why spend more?