We have a large one which our cat Links just loves to stay outside in ...all day and night if we would let him. Also have a smaller one to take with us if visiting etc. (We also serve food to Links in the tent when he lets us know it is time to eat....as he does not want to even come in for that. LOL)
My daughter has the same ones for her cat and when we are together both cats have a ball inside the tent, watching the world outside and wrestling when the mood hits them.
We have had our original large one for almost 3 years. We take it with us to Florida and back, and it has been used almost every day 12 months of the year.
Bought them both on Amazon.
link