She doesn't seem to like it much..
She'll often get up after sitting on the Casper for maybe 20 minutes then move into the bedroom and sleep on her old bed, alone.
It's not big enough for her either, she's not a very big pit at all by comparison but she spills over the side with her head inevitably laying on the floor.
In the picture it seems bigger and puffier than it really is. I think the lack of sides is a contributing factor to why she doesn't like it much. 
Will probably return it..  :/