It's not bad. The problem with the Big Town show isn't the show, it's the venue. Lots of cars have been broken into in the past, and the Mesquite PD has been nonchalant about dealing with it. When a rep from the MPD spoke to my group that volunteers with the Grand Prairie PD, he made some comment about the gun show "causing crime," and when I asked why they never have one of their MULTIPLE skyboxes out there, he just talked about how they wished it would go away. There have been members from this board that have had the gas siphoned out of their vehicle, too.
The show itself is decent, if a little on the small side. It's probably 1/3 the size (or less) of the Market Hall show. I was there a few months ago and there were actually multiple police cars sitting on the far end of the parking lot. In the past, there was only one parked up against the building with the cop inside in the AC. Hopefully, this represents a change in the PD's attitude/commitment.
If I were you, I'd prep to go to multiple shows and be ready for that one good deal you'll come across. There are some real deals to be had for the patient...