Some full erase upgrade, some "in place" (the $40 option)
This is not unique to me, and seems to be especially a problem with certain Lenovo boxes -- though apparently it's been reported with other ones.
The machine insists on upgrading, then goes through its routine, then abruptly stops mid-upgrade, reboots, and goes blank for a while, then finally after a couple of automatic re-boots, it says "upgrade failure" or something similar, and back to square one.
It doesn't seem to interfere with function of the operating system once all the fuss is over.
But I still can't see any advantage to Win8 over Win7 -- it is lots more clunky for non-touch-screen users, and control of the operating system is much more difficult. I am still learning about some shortcuts (like WnKey+x) that get you to interesting places.
Tom Duncan