TechReviewSource.com posted their review on Windows 7 Release Candidate. Here's a taster:

Overall, we can comfortably say that Windows 7 is the best version of the Windows operating system to date. As we said in our beta 1 review, Windows 7 has the stability of Windows XP and the look and feel of Windows Vista. The operating system responds quickly and without hesitation and generally feels like it works nicely. Microsoft has definitely worked with the elements of Windows 7 that are "under the hood" and in the code, which is seen by the stability and fluidness of the operating system as a whole. Without a doubt in our mind, we believe that Windows 7 will be a huge hit when it's released to the public in late 2009, mostly due to its rock-solid stability and performance. It would also seem like Windows 7 is the first real competitor to Apple's Mac OS X and is exactly what Microsoft needs if it wants to stay ahead of Apple and regain some of the ground that Apple has taken away recently. Anyone who still uses XP and is afraid to upgrade to Vista, Windows 7 is exactly what you need, even if you are using old XP-designed hardware. We, however, would not recommend users with pre-XP operating systems and hardware upgrade to Windows 7 simply because the computer would be too old to run most of today's software programs. Users running Windows Vista will want to upgrade to Windows 7 even if they feel comfortable with Vista because you will want to snappiness of Windows 7 and those small features that are new.