I love these. They're light, easy to carry and fit easily in a vehicle. They offer a variety of privacy/covering options, decent ventilation, and have held up well over a couple of years of moderate use.
They *can* be a little finicky to pop up/down, but nothing major. Very stable, I don't think most dogs would be able to roll them.
My Belgians love these. One is quite environmentally sensitive and has always been a little worries about crating, but he has been happy in these since I first started using them, and seeks them out when he starts to stress.
I dearly wish Clean Run would come out with a larger size, though, as these are a bit small for my 25"+ dogs if they want to do anything other than lie down.