We bought this because as sweet kitty decided he wanted to live on our front porch. And it was getting on to fall and I worried about him. So we bought this and he loved it!! Husband and I put it together in about 45 minutes. I did add some insulation (safely!) and we put a heated bed on the top level, blanket on the second. I did not use the clear strips at the front entrance. Kitty lived in the house until December when we officially adopted him. BUT, the kitty house came in with him and I have it in my office where Luke the Cat still uses it. He likes to get on top of it but when the weather is cooler, he gets inside. Loves it. 
It's sturdy, roomy and if you have multiple outdoor kitties, they will be quite comfy in this house. I love the multiple levels - only thing I'd like to see updated is the entrance to the second level. The opening is right in the middle of the floor and I think it would give more room if it were set to the left.