We got the Chick-N-Barn and bought two of the runs to go with it. We keep 9 chickens (one is a bantam) in it, but added an extra roosting bar inside to maximize the vertical space. Our chickens stay outside most of the day, and we expanded their run room with fencing because the two runs was not enough space.
We did not think the Chick-N-Barn would hold up well to cold weather and snow/rain here in Ohio, but got it because a storm blew down a large limb on our previous chicken accomodations and it was the best quick fix we could get locally. We added a layers of styrofoam insulation and siding to the outside, and roofed it with asphalt shingles. We are also going to outfit the doorways with pet doors for the chickens to let themselves in/out. After getting the darn thing in September, it is already looking worn out and a little rickety.
I would NOT recommend it, and wish there had been some nice playhouses available when we were looking. They would certainly be sturdier and more weather resistant - with a little work they would be perfect for chickens (adding roosts and nest boxes, etc.). The Chick-N-Barn was not worth the money we paid!