My DH always wanted one and our sons and their familys gifted him with one a few years ago as his Father's Day gift. He planned to take read in it and take his afternoon naps but unfortunetly he had the hardest time getting in and out of it and almost hurt himself. So it was returned for a nice highback roller office chair for his at home office, at leas he has less chance of falling out of the chair, LOL!
Make sure you can return it if your Dad has a problem.