I didn't read the other posts but just flew from niagara to lakeland with direct air last week. We didn't have family ties tickets but did purchase at the 50% off price. I think we paid just under 700 for 4 of us, with 2 bags each way.
I would highly recommend it. The airport was beautiful and so much easier than a large airport. Also, when landing, the luggage was out so quickly. The whole process was very easy.
The flight itself was very no frills. There was beverage service but you had to pay (we just bought drinks and brought them on), and there is no entertainment system, but the flight is short. I think the flight attendants were bored as they kept coming by about 20 times to see if anyone had any garbage, lol.
Going back we had to stop in myrtle beach but that was very easy as well, we didn't even get off the plane. PM me with any questions.