I got Windows 7 Enterprise last week and installed it on several PCs. I installed it on my main work PC as an upgrade from Vista and also did a clean install on a test machine.
The upgraded machine:
White Box
AMD Athalon 64 X2 5400+
2 GB RAM
ATI 3450 video card with 512 MB
The upgrade was slower than I expected (close to an hour). I did run into a couple of issues right after I upgraded. The IIS was corrupted and had to be uninstalled and reinstalled. AVG also seems to have problems with upgrading, it caused problems with internet explorer. If you are doing an upgrade than I would recommend unistalling AVG before the upgrade and then reinstall it after. Things have been running well since I fixed the initial issues. The first big difference you'll notice is the taskbar is totally redone. It is a vast improvement with a number of nice features. The first few things on this list are about the revamped taskbar
http://www.techradar.com/news/computing/pc/18-cool-things-windows-7-does-that-vista-doesn-t-628892?artc_pg=1 The performance seems similar or a bit better than Vista (provided your Vista was updated and running well in the first place. Windows 7 is a huge improvement over the initial release of Vista). I've got several dozen programs installed on this machine and everything still seems to be in working order.
The clean install machine:
Dell Optiplex 740
AMD Athalon 64 X2 5200+
2 GB RAM
Integrated video
The install took about 1/2 an hour. I got a nice surprise when I booted it up for the first time, no drivers to install. Windows 7 had found and installed all hardware. It joined to the domain no problem. I had no issues installing all our business apps including an old VB program. AVG installed and is running fine. When I was adding the network printers I was surprised to find that it did not have the HP Laserjet 8000 driver (it is an old printer).
So far I'm happy with Windows 7. It seems like Microsoft finally has a quality successor to XP. It has some nice
functional new features(see link above). Microsoft does still include UAC but it is much less annoying and I do see the value in it. Has anyone else been using Windows 7? Thoughts? Problems? BSoD?