I just bought the C-130 Pro base pack, plus the expansion pack, and AC-130 pack for this bird. I've had a few minor issues - almost all easily corrected - with their F-104 and MiG-21, so had no great trepidation about d/l-ing and installing. Both went smoothly. The aircraft is an excellent product, as are the add-on packs. I have just one question. This doesn't happen every time I run it, but now and then I'll get a msg at the end of the flight saying FS is low on memory, and will now close. I can close out of the flight, and even log out of FS9 but then get this msg and the flight time is not recorded. Is this thing a memory hog?