Frontier Airlines EarlyReturns - Has anyone redeemed miles?

Just curious... Anybody had an experience redeemding miles on Frontier? Given their past connection to CO, I was wondering if they it was easy or difficult to get a ticket for 15,000 miles?

I've done it twice. Both times were during the holidays. I guess I was lucky. If you want to check availability, award seats come out of "s" bucket on itn.