It took my feral cat about a month to decide to go in the house.  Now that she uses it, she’s in her house all the time staying out of the wind and rain, keeping warm and dry.
The house was easy to put together with all Velcro seams.  I really like the door flaps that keep the rain out.  One concern is how long the house will last being out in the open.  I do have it off the ground. I  think it would be better under a carport or in a garage.  But it’s working beautifully now and I don’t worry so much about Carolina being out in the cold.