I bought this for my parents new Airedale Terrier puppy.  They keep it in their living room in an area set off from the seating and the TV.  It's been really hand for them.  It allows them to contain the dog (now seven months) and leaves him with room to strech his legs or thrash his toys around a little.

It's only fallen over twice and he's getting to be quite a big dog.  It only happened when the pen was sort of streched out (not round like it should be).

Overall good purchase. Ordered on Thursday, had it by Saturday.