LR user since 1.0. I think it's a great program with a bright future.
Small problem w/2.5:
On exit (File > Exit) there is a small patch of screen (vxh = 1"x3") that does not clear the lr image. The affected area refreshes as soon as I open another window (any app.) over the same screen area. As a more or less anal geek type, it's slightly annoying. Tried switching to decaf, no good. Still annoying. I run two screens, it happens on each screen. IOW, it doesn't matter which screen I put the main lr window. When I exit, the same small patch remains in the same relative screen area (upper left quad). No other app does this.
OS = x64 Vista Ult., updated
RAM = 6 GB
Video Card = ATI Radeon 4850, dual head DIV