FSX will work or no?

Hi there, I have many questions being very happy with FS9, I would like to know a few things.First off, if the demo worked, then will the full version work the same in terms of performance? Do I need to delete all traces of the demo?Second, I have heard of things such as refueling trucks, pushback trucks, baggage vehicles, and glider tows, are these really apparent in the game and do they work? If so, what are the key commands?Third, I have heard horrors of registration issues and deactivation nightmares, is this true? If so, does SP1 help and is there and easy way to completely deactivate your copy without going on the phone?Please answer these questions as I don't want to throw $70 into the trash can just right after buying it.