I have performed a Windows7 upgrade and clean install on my laptop to test both processes. I was happy to see that in both cases my preexisting data and profile were saved in the root of the C: drive in a renamed directory called Windows-old. I obviously did not blow out the existing partition when I performed the clean install.
I find it to be a bit more snappy as well. No issues at all so far and it has been about 30 days. My 10 year old HP printer does not work with Windows 7 but that is a HP issue / decision not to release any signed drivers for Vista. Time to buy an new printer. :-)
In a recent article in TechNet, there we some interesting tips to prepare yourself for Windows 7. There are a lot of useful tips, including, of course, learning the Power Shell.
While I haven’t tried it yet, but Shawn Hensger who works with me, has been using it on his Dell laptop for several months and is in love with it. I don’t know how much weight that really carries because he was in love with Vista too.
The biggest issue uncovered by us so far has been printer compatibility. Windows 7 is only compatible with Signed-Drivers. This throws out most of the legacy printers.