I installed it. I like it quite a lot; the interface seems a lot faster, and Spotlight works really well. I can see it helping me out a lot. I have a lot of research papers stored as PDFs on here, but they're not organized at all. When I want to find one, instead of looking through them all one by one, I can type something like "roskos siebert biomedical" and pretty much instantly find Siebert and Roskos' paper "All-optoelectronic continuous wave THz imaging for biomedical applications", which otherwise is unhelpfully named "m22110.pdf". Nice.
Dashboard is interesting, but there isn't anything there that I can see using constantly. I like having quick access to a version of stickies that disappears when I want it to, though, and the translator is an interesting idea.
There are some sucky things so far:
1. My Quicktime 6 pro key doesn't work with Quicktime 7, so I can't do fullscreen playback unless I pay Apple another $30. QT Pro was useful when I was recording all of my vinyl records onto my computer and compressing tomography data as movie files, but I don't really get enough use out of the pro features to justify giving them more money. Why is full screen a "pro" feature anyway? At least on the Mac version, it seems stupid.
2. The Cisco VPN client breaks with Tiger. This means I can't run Matlab from home until they fix it. Shit.