I am not a fan. I flew Spirit from DTW to DIA and we were very delayed for all flights-- no explanation, no apologies, very "normal" for them. I also think they nickel and dime the heck out of you for seats, bags, etc. and their policy on carry-ons is different from some of the other airlines (I saw numerous people forced to check bags at the gate for $100 because they were too large to be considered a carry-on. Cost to check them at "check-in" was significantly cheaper. This probably could have been avoided by travelers doing research, but it still sucks. I'm referring to the small-type suitcases that were very common after airlines started charging). I don't know if other airlines are now as strict as Spirit, but by the time I paid for all the "extras" it was costly for me. I know that a lot of business travelers like it and I'm sure others have had good experiences, but 2/2 flights delayed for me meant "no." Also, their customer service was atrocious.