Couldn't wait, huh, Reks? Let us know how you like it (or don't). Of course, now that you're installing it, watch Apple release 10.5.1 next week.
It's been almost two weeks since I've installed it on my iMac and I have had no issues with it. I'm using and liking Spaces now after figuring out how to assign Finder to all spaces. It was rather handy when I needed to have almost 20 Word and Powerpoint documents open at the same time. I didn't like the 3D presentation of Dock, but I just changed it to 2D via Terminal and it's a lot easier to see again (like Tiger). Time Machine's working for me fine, but I don't have too much files, and I don't make too many big changes that often, especially with majority of my music files saved elsewhere.