What we're trying to do with SSM2007 is hit you all with new and challenging missions that will put even the most experienced users to test and thus maintaining your interest in the game (sorrry, "sim") a long time after the purchase. STS-98 is one of those missions.
After finishing all the missions on the "low" settings, don;t forget that the real hard core gamers restart all of them in "high" difficulty - only using printed checklists (Michael Swannick has been providing an excellent set for some time) , just as real astronauts do.
After you finished them all on "high", you can really say that you are a pro on SSM2007. Meanwhile we add new missions so you'll have your hands full for some time, LOL!
/Admin