well - honestly - maybe up till two years ago - you could update anytime with apple - you knew it was working, but now I think its going in the wrong direction
Former updateds occured maybe once or twice a year - now they send out a new OS - whether iOS or MacOS at least every year - if not faster
I stopped that sh** - I am not a beta tester for them anymore - stay till a real big major update on 10.6.8 and iOS5
Apple discovered the "Mass Market" of "cheap" funky looking devices - the Pro Sector (I am mainly in producing Music & Video) is totally neglegted