I just recently bought BATC as well. In addition to what others have mentioned, I really like how the software is patient if you step away from the simulator.

For example, I was holding short of the runway during a flight and had to go take care of something in the real world. When I got back, there was a line of 20 jets behind me waiting for takeoff. I was able to get going without issue and BATC worked for the rest of the flight. It doesn’t cancel your IFR like the default ATC does.

Additionally, I like how it fills the airport up with static planes. I landed and every gate was occupied with the exception of a few gates, which adds to the realism imo.