The only issues with a supercharger are higher octane requirements... and if you run lower than the reccommended (hey - while youre reading the manual for reccommendations, note there's a paragraph on running lower octane fuel too), then you should only fill enough to get to a gas station with high octane available.
The X is smart enough to retard timing and other factors so you probably won't hurt it while running lower octane, but don't expect any performance gains with 89 unleaded. I wouldn't push the engine at all if running midgrade or regular - the more you ask for, the more youre gonna start pinging.
Wish I could see OBD enhanced info on my X. On my last car, I could see how much the PCM retarded ignition due to the knock sensor. I can't even get manifold pressure off the 2002 X with my scanner.
Some people warn about high temps with a supercharger, but I don't think you'll usually get hot enough that the engine can't maintain control of things.. Of course, I haven't driven in stop-n-go during the Texas summer yet either!
(would I need boost in stop and go traffic anyhow?)
I think I'm going to end up using mobil one as well... I know it isn't required, but I intend to keep the X over 100K, and it's worth the extra expense if I push oil changes to 7500 miles. (yes, yes, and either get a bypass filter or change filters every 3750).
Too bad the SC is so new... no history to use.
No aftermarket manuals out yet either.