I haven't redeemed a standard EarlyReturns award in quite a while, as they've never been available when I wanted to fly (I am at the point when I want to travel during the peak/popular times and am not willing to sacrifice my convenience to save some miles), however I think that the EarlyReturns Plus awards are fantastic. 30,000 Miles for _any_ available seat, any time. Compare that to United, where the difficult-to-get "saver" seats are 25,000 miles, and "Standard" awards are 50,000. Plus, United charges $50-$75 for last-minute awards, and $100 to change city pairs or to cancel and redeposit. Frontier has no fees for the former, and $35 to cancel/redeposit.

On several occasions I have booked seats the day before major holidays which were selling for $700-$800. Plus these tickets are completely changable, at no additional cost, as often as you want before travel. The only requirement for this is that you have at least Ascent status, but 15,000 miles is pretty easy to fly each year.

It's getting tougher and tougher to redeem "standard" awards on any carrier, but I think that Frontier's extra-mileage awards are the best of any carrier.