I am not sure what an update does. Just the fact that you can revert to Windows 7 makes me wonder if it converts files adding more files and chances of corruption. On the other hand, maybe what is saved is your compressed windows 7 OS and files. Just like Ghost use to do.
I know a fresh install wipes aways all the old settings and corrupt files. That's why whenever anyone asks me to help them fix their computer I always try to point them to do a fresh install. If they format first, that's even better. It takes a little longer and you do need to go to windows for all the updates later but the computer will run like the day you brought it home.
I don't believe Microsoft has a good enough track record for me to convert right now. Considering the amount of hardware that is compatable; that windows works at all is still an amazing engineering accomplishment.
Apple has complete control of the hardware and software. That's what you are paying for and I think the gap has closed quite a bit since the "good old days" when they used to charge $60/hr for repairs.
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