Airlines like this are great unless a flight gets canceled or delayed.
If weather is bad, small guys like this have very little power at the airport and wait forever. Likewise, if a plane gets stuck, they have no more flights for a day or two.
They are great 90% of the time and if you DONT HAVE to be there. If you time is very valuable and you need to be somewhere, they can be a problem through no fault of their own...
When I am flying for fun, I pick the cheapest. When I must be somewhere I take American since American has 100s of flights each day out of MIami and has another flight to just about every city 2 hours later...
Sean