It took her a couple of days to get used to it,but now it’s her spot of choice for overnight.  She also likes to drag her toys there during the day for some heavy duty chewing in a private space... 
I was a little surprised that it comes in pieces that have to be put together.  I thought it would be one rollout-piece like my human Casper mattress.  Because of that, it kind of feels like it is made from “scraps”, but my pup loves it, so good enough!