I have the beta of Windows 7 and in my opinion it's very good. The design is nearly the same as at Vista, but its much easier to change any settings, etc. than by Vista. Also hardware as a printer or a microphone are working without searching a driver for them and even many PC games, which didn't work on Vista work on Windows 7 again!
EDIT: Btw I think that the client will be released on May the 5th!
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