Let me tell you, they love it! At first they just milled about the coop entrance, but as soon as the first adventurous hen decided to to try out her wings, they were all over the yard in minutes. When it was time to go up for the night 14 of 16 went straight to the coop and put themselves up. We only had to corral 2 of them. They probably would have figured it out eventually.
I am a little worried about the dog chasing them and some of them flying over the 4 foot fence. I had the puppy on the tie out for this trial run. They came right up to him and he just looked at them. But, when they run from him, his instincts to herd take over and he chases. It may be a while before I trust him around them off the tie out.