It is an excellent Modern Combat Sim. If you don't have that great a PC, you could still run it, but without all the fancy graphics settings. If you want to fly MiG-29s, Su-27s, Su-33s, Su-25s, A-10s, and F-15s in a 1980s-1990s setting, go with Lock-On. If you want to fly F-4s, A-4s, F-100s and other Vietnam Era aircraft in a less modern setting, go with Strike Fighters. Lock-On can be extremely complex if you set all the options to their most realistic settings, however, you can scale it down to make it easier also if you don't want to take the time to do the training missions and learn the systems of all the aircraft.
If you do get Lock-On though, get the Flaming Cliffs add-on, it really adds the the experience.
