From the gate agents to the flight crew I truly feel that this airline puts the customer first which is very rare these days. I am a Denver resident and travel on Frontier once a week for business and have never had a lost bag. I have also rarely been late to my destination. Of course there are times when the plane departs late, but they are almost always uncontrollable circumstances such as weather that would effect safety and are out of the airlines control.
Frontier is also in transition to become a low cost carrier. Everything will be a la carte from carry on bags to seat assignment. But I think this is a good approach because you only have to buy what you are going to use. So if you are a light traveler it will be possible to get some really cheap air fare. Kind of the same approach as Spirit but the difference is MUCH better customer service. Go Frontier!
Cheers!