To start with the reason I was disappointed in Vista was because I thought it was going to be a pretty good step up from XP because of the time it took to develope.

You say that "SuperFetch makes optimal use of RAM to make application load time practically instant"

This has not been my experience or the experience of most of my customers or other techies I have talked with. When I try to open my pics folder in XP it renders all thumbnails in that folder in less than one second. With every Vista machine I have worked with I click then wait on the little green bar to make its way across the top. Sometimes it takes 3-4 sec. sometimes longer.
As for apps. its the same thing. They seem to take much longer to open if the open at all, sometimes I just get a " this program is not responding " warning at the top.

The 35-40 customers I was speaking of had vista come with their system. They called me because they were sure they had sypware or viruses slowing their system down when if fact it was just the sluggish proformance of Vista compared to the snappy XP they were used to.

Why exactly are you so pro Vista?