My outdoor ferals (27) love it.  I have 8 or 9 shelters on the property and added this one
 Put a little blanket inside helps for warmth.  Was going to get heated one but I am afraid to plug those in outside.  Everyone says u can do it.....but what happens when it rains
Snows?  In michigan so have wet weather all winter.  I'm afraid they would get electrocuted