I ran the Windows 7 RC. This answered the questions for me. I don't have any problems making this move.
However, if your machine is working, why not stick with what you got?
When I get back from my current assignment in Tanzania, I intend to reformat and spring-clean my Toshiba Portege M700 notebook (bought April 2008, has 3 Gb RAM, 160 Gb HDD, Intel Core Duo CPU T8300 2.40 GHz, Mobile Intel 965 Chipset Family, allegedly ok for Windows 7 according to Microsoft).
Before now, I have usually waited some months before upgrading the OS, but as the majority of reports are favourable, I wondered about going for Windows 7 Professional next month.
Any naysayers, apart from the usual caveats about drivers etc?
Regards, Kibo Kid