Just finished my first RT on Frontier tonight SFO-DEN. I'm hooked!

Everything the F9 employee talks about above is true. =)

Drinks; they offered a single drink to each person. Someone asked for 2 drinks at once, the FA said, "one at a time" and sure enough they came through a second time. Also offered the snacks on board free.
Overall, the staff, the planes, the extras on board, I love it.
Tough to ditch UA because of intra-Cali flights, and NW for international, but F9 is added to the "a" list.