Very nice. I also got the "not compatible" warning on install, but have seen no issues on my N95-3NAM. The accelerometer support is nice.
Face browsing is more miss than hit -- faces are only detected if they are large, facing the camera, and vertical. Tilted or turned faces aren't recognized. Any blockage (finger on chin, etc) seems to befuddle the detector.
I have a large number of pictures on my phone, and after giving the program time to look at them all, it seemed happy. It does seem to limit searches to "user" photo directories, and does not show system icons/pictures like the default gallery app.