If Spitfire 40 is the prettiest flight simulator that I have seen, then Strike Force Harrier has got to be the most complex. Vectoring in forward flight (VIFFing), ground tracking radar, missiles, bombs, cannon and ground targets are all a part of the game.
Most of the keyboard is used for all the functions that are available. Their status is shown on the lower part of the screen, leaving the top portion of the screen for the display - though this is obscured by the head up display and in-flight status information.
The representation of the ground is very good, the tanks on the ground are nicely coloured, though the horizon is a bit flat - but, you can't really expect miracles for under a tenner.
The gameplay is very good with you trying to knock out the ground targets whilst being shot at by same.
I found that there was a small problem with the map/ground radar section. In that it represented you as a moving dot, but it leaves a trail behind you. After a while this can occlude the map and make it difficult to see exactly what you are doing.
Other than this, it is a very enjoyable game to play, with more in it than your standard run-of-the-mill flight simulator games.