My parents have flown from Trenton, NJ to Florida twice times. No issues. You MUST make you you do online check-in a day in advance. You also MUST be completely checked-in and past security 45 minutes before the flight, or they will not let you board. My friend had an issue and got there at 8am for a 8:30am flight and they turned them away in Trenton. Also, it is cheaper to pay for your bags in advance. Except for a personal bag that can fit underneath the seat, they charge for carry-on bags. Overall they had no issues and was cheap! The Trenton Airport is super small and easy. I have looked at them a few times, but they only fly certain days to certain cities. Also, don't except treats for free. It is no-frills, but definitely cheap with their sales!
Hope this helps!