This is the best flight simulator Microsoft has ever produced, there no doubt about that... Excellent graphics, new features such as GPS navigation, more airports worldwide, better weather system, and easier to  use. There is a downside to all this I think the consumer should know. The  speed of the game is NOTICABLY slower compared with MS FlightSim 98 and  below... Very glitchy all-around. I could not seem to speed it up (usually  averages around 20 frames per sec) even with setting the detail settings  lower. To put it in perspective, I have a PII 400mhz computer with 192mb of  ram and a 16mb 3dfx Voodoo 3d accelerator card. I even bought the  accelerator card to see if it would speed it up... it barely does! I am  recommending anyone who wants to buy this program and likes a fast,  non-glitchy game to be aware that if your computer has a processor below  300mhz, you will not like what you see... Microsoft says that you must have  a 166mhz minimum! HA! You wouldn't even be able to fly the graphics would  be so slow.