you will be very happy with your powerbook. they are built very well and will be usable for years. and im talking about usable in a comfortable way, unlike my tp600. its many many years old.
now onto the old's chevy, buick argument.
general motors is the parant company for alot of things. you think microsoft has power, think about GM, they own hugh's (direct tv), 20% of fuji heavy industry's (think subaru), saab, oldmobile, buick, chevrolet, gmc, saturn, pontiac, cadillac, opel, hummer, and probably alot more that i don't know about.