My 6 y/o pit loves to snuggle under a blanket, even her head, so this bed was the perfect solution.  
At first she was skeptical and didn't want to go all the way into it.  Eventually she laid inside but stayed close to the opening.  Now, after just two days, she burrows all the way in and looks so cozy.  She loves it!
Also, it seems to be very well made of good fabric.  There's a zipper on the outside so that it can be washed.  And there's even a zipper on the inside cushion so that more filling could be added if needed; but for now it seems to have a very sufficient amount.
I really like the fact that the inside fabric is not that cheap thin stuff that tears easily when my dog tries to 'fluff' her cushion.  It's a very sturdy fabric.
I hope that Wayfair will always carry these beds in case I ever need to replace it.
My dog is a husky 70# and I purchases the largest size.  She has plenty of room to move around inside.