Worth it. My experience is here:
Winter Camper Cover
If you are concerned about damage, the Camping World/Good Sam protection plan that has come about for the ADCO covers cannot be beat! If you time your purchase just right when they are on sale and you have a member coupon, you can get the coverage at no additional cost.
The first year you use a cover is typically when you experience damage because you haven't figured out what is too tight or too loose or where your stress points/points of abrasion are to pad. I'll admit, brand new camper, brand new cover, and even though I have MANY years of experience covering, I missed a stress point and wore a hole the size of a fifty cent piece over the winter. No problem, ADCO is sending patch fabric at no charge, and we'll see my brother during trips this year and I'll have him stitch it properly (he's a canvas maker).