I had the PDC CTP on my Netbook and that was OK so I had not expected any major issues. That said it has not been without problems, but all the issues I have logged as part of the beta program have been related to hardware detection (missing base stations and ignored physical Wifi switch state) on my Acer laptop. However, these issue can be worked around i.e. don’t use sleep or hibernate. so have not stopped be using the beta on my primary PC.
As to using Windows 7, I like it. I am find the revised UI easy to use, and it certainly seems faster than my Vista build on the same PC, but this might just be the fact it is fresh install on a formatted disk.
I will report more then I have used it for a few days in the real world