Started playing around with it over the weekend. Flight sims have in the last 10 years or so become a bit of a niche market, but it would be great to build a South African community around this one since it supports multiplayer (for missions, co-op or dogfights etc) and has a good mission editor. It's probably the most realistic sim I've come across!
The game engine along with a SU-25k is available for free (additional aircraft have to be purchased):
Here's a nice clip to get you into the mood