what sort of problems are you seeing besides the slow copying/networking issues?
Slow performance, in general - not just networking, but also desktop performance, memory and CPU usage, program loading, etc.
As well, annoyances in the interfaces - it took me *7* confirmation windows to copy a program to desktop, run it, and delete it, above what XP asked.
As well, annoyances in the interfaces - not only is very little in the same place, but very little is even in the same menu. While I understand putting Device Manager under the Control Panel - it always SHOULD have been there - renaming Add/Remove Programs was just a pain in the ass, and the Control Panel loads so slowly that it's a serious problem to find the right panel to get programs added or removed.
And then there's stability issues.
On three genuine "vista-compatible" Dell Dimension E521s, two of them shipped from Dell with Vista installed, Vista Business crapped out roughly once a working day and froze, hard, requiring a reboot. Since installing XP Pro, not one crash. On two stupidly expensive Lenovo X61 "vista-only" tablets, Vista freezes for 20 seconds at a time, regularly, and locks up hard requiring a hard reboot roughly once every two business days. On a pair of el cheapo HP laptops purchased last month, running Vista Home Premium and Office 2007 Standard, the machines crash every 3-4 hours of use. The same happens with the same machines and Office 2003 Professional, and OpenOffice 2.3. The problem is clearly Vista.
I have not ever found a stable Vista hardware configuration. The hardware guys I buy from haven't found one, in laptop or desktop configuration. *DELL* hasn't managed to create a stable setup, yet.
I believe you when you say you've found one. I, simply, haven't seen it.