I still regret buying a Vista OEM DVD about a year and a half ago, just because I thought it looked cool.
I had it on my notebook for 6 hours, when I started noticing it's nearly harddisk destructive backgroundtasks in idle mode. I spend about 2 days tinkering the system,disabling services,learning the difference.
By then I figured out my batterylife went from 6 hours on XP, to a little over 4 hours on Vista. Not only that, but I had these enormous amounts of continuous annoying popups...
Despite it's good looks, Vista comes second last, on the same level as MacOS.
I regret buying the Vista OEM DVD, and wished i could ship it back to MS, and get a refund.
Everywhere I use XP, which I still think is the best OS out there.
Linux goes second place, and against all others, I find Mac OS Dead last (next to vista).
The 1 mousebutton in MacOS is such a turnoff, as well as their high priced notebooks, and slower system components then similar same day released pc hardware. I find Mac OS just so unpleasant to work with... Different, non professional.. seems like been made by artists who wanted to funkefize Win.3.11.
The right mousebutton is worth Gold to me,no way I'd want to exchange that!
Linux (Mainly Ubuntu) is on second place, because video and game acceleration is still slower then XP, and because the OS has a similar feel as Win98;doesn't seem to like respond instantly.