I've used these fenders for years and they fit my needs perfectly.  I use five of them with my 28 foot boat.  They are incredibly strong, hold air well, are easy to inflate and easy to clean.  They leave no marks on my while hull and they look OK even after several years in use.  Since they are almost the de facto standard at around the Pacific Northwest, you can find lots of accessories such as bow racks and covers for them.  The only problem is that others like them too and they occasionally disappear from my boat.  I recommend them highly.