Flew Frontier recently for the first time. Trying to save every penny, decided to give it a try. "How bad can it be?" The answer is pretty bad.
Unlike some, I found the flight crew to be nice and the gate attendant was polite. I knew of the expense of extra bags and paid the $35 each for carryon and checked bag. (It's $50 each if you wait until reaching the gate)
Until Frontier I'd never noticed how American Airlines and others "notch" the seat in front of you. This gives your knees a small amount of space. And, the seatback is padded. Frontier eliminated this "frill" and when you're 6'2" tall....your knees are jammed into the hard plastic of a straight seat back. I suppose for a 1 or 2 hour flight it would be ok, but 5 1/2 hours....yikes.
The seats had almost no padding on the back and minimal on the bottom. Ever notice how when you first sit in an airline seat it feels comfortable for a few minutes? Not so with this one. KNEW it was going to be uncomfortable immediately. And, if you have a "personal item" it is NOT under any circumstances allowed in the overhead. So, feet on briefcase for the flight.
If you want the Frontier experience without paying for it.....take a cheap plastic lawn chair, put one directly in front of you, and sit in a cardboard refrigerator box for 5 hours.
The flight was uneventful and they tried selling expensive refreshments. At the end they even offered 40k in air miles if you signed up for something. I'd have given them a $20 just to straighten up next to the window seat.
There are three positives. One, I tried a new airline and doubt they will be in business in 10-years as their return customer numbers have to be low. Two, found out padded seats are a "frill." And, three, it made Economy on the American Airlines flight home feel like business class! (Which, by the way, I've flown one time....and it was life changing.)