Meh, I'm running 7 Ultimate (technet license - full version, not the release candidates) on a Dell Latitude E6400 and I'd like to say that so far, RDP is NOT better. It hangs on closing to the point of needing a system reboot. I had better RDP in Ubuntu 9.04, Vista, and XP than this. Sometimes a reboot helps, but lately it has been pretty consistent in the hang on logging out of an RDP session.
Office 2007 (outlook) hangs on certain emails (one from the local Apple store, go figure), and hung on printing an email from a vendor. If I load up my XP VM (for my phone system admin software) Outlook 2007 works fine on the email and printing.
Power management certainly is not better than Ubuntu. I had longer life on a charge from Ubuntu than I get now with 7 - this is with unmodified settings in either OS.
Boot up was generally faster than Vista and XP, but is starting to slow down. Overall time to desktop is definitely better, but with age it is starting to slow down like previous versions of Windows have.
Shut down is another story...sometimes it hangs and I have to hold the power button down to get the laptop to shut down. Other times it seems to take an eternity but does shut down properly on its own.
All drivers are up to date, all updates from Microsoft have been applied, and I am running the Microsoft Security Essentials to see how well it works (so far it seems ok, but haven't really tried to purposely infect the machine).
Overall my impression of it is an updated version of Vista. There are some nice features added to it, but at this point from my experiences I'd say hold off a bit and wait for some updates to come along for both the OS and the hardware drivers.