We had the Pop up one when Ruby was a pup, it was great. When we were visiting I took it along so that she had a place she could go that she felt comfortable and safe. Or when she was being a little naughty!
We ended up putting it on the back verandah when she got a bit older and over time the door was chewed off, not sure by whoch dog as there was two of them at the time!
We want a metal one for when we go camping cause they are more open and breezy for the car ride and also a bit more stery if we have to lock her up in there some whatever reason.
If we had another pup I would sooo Get the material ones again! I found the cutest pink one that I am so tempted to buy