Loved my five years at Ellsworth. It's a hidden gem of a base. People who have been there love it, people who have never been there think it's southern Minot.
Decent sized town with a good bar/restaurant scene, lots of live music and performances, plenty of hiking/biking/fishing, Deadwood's casinos are about 45 minutes away, Sturgis is about 30 minutes away...
I enjoyed it. It will get cold in winter, but if you live in Rapud City proper the hills will screen you from the worst of it.