I never really went overboard on the DID sims. I found that F29 Retaliator wasn't really deep enough, but that the game engine worked well for something like Epic.
My favourites were Falcon, which I could (and did) play all day and of course F18 Interceptor. Flying around the bridges and buildings of San Fransico on full throttle was great fun, but I never did complete the last mission...
I did once try Jet Pilot which really was a class act. The attention to detail was impressive although it was a bit much for my 40Mhz 040 to handle I felt. I'd love to see a new version of this game for the AOne...