The RC starts to die in march 2010, then goes out completely in June (I think). Word on the street is it'll be official at least before March, other rumors have it out in late 2009.
Tell ya what - I've put two clean installs on two different laptops. One is a 5 year old P4 machine, the other is a 2ish year-old Toshiba Tecra 12" laptop. Installation was absolutely hands-off and quick on both.
So far the only problem I've had is with my aerial camera software. I use an embedded video object to pull live video from a USB digitizer from the main camera system in the airplane. The video gets displayed in a window with orientation lines overlayed on it. Works great... except in Win 7 the video will not stay in the parent application. No matter what I do the video detaches into it's own window.
There's a lot of talk about running virtual XP under Win 7 so that might be a solution.