I have an Orvis bolster bed with fleece cover, and the dogs love it so much (but wont sit in it together - as soon as one hops out the other hops in) that I have just bought another, this time the wraparound bed with fleece cover. Dogs love resting their heads on the sides.
I wasnt sure about the water proof beds - the fabric didnt look very comforting to sit on, and I thought they might be rustly, whereas the fleece is soft (not that I think dogs are particularly bothered, really).
The Orvis covers come off easily for washing and dry quickly - I wanted a bed where the cover would come off, rather than having to wash the whole bed.
Neither of mine are bed chewers, so I cannot say whether they would stand up to being chewed.