Booked a round trip for $150, chose to upgrade seats on both trips for a cost of $20 - both flights were only 1/4 booked, total was $170. Entered all info then selected "Book it"; screen didn't refresh with a confirmation, but took me straight back to the listing of all available flights.
Called the support number to explain, and man on the phone said that the flight data had changed from Frontier, which I questioned. He said he could book me if we walk through the details, which we did, and ended up with the EXACT same details for the flight I tried to book initially. New price: $187 and WITHOUT seat upgrades.
At this time, I went to Expedia.com and entered all the same information and in less than a few minutes booked the EXACT same flight for $160, w/out seat upgrades, and just hung up as the guy began to get rude. They called me back and I picked up on about the 8th call and told them no thanks!
Product or Service Mentioned: Cheapoair Flight Booking.
Reason of review: Not as described.