I am using the latest version on Windows 7. I have been using Picasa for years with JPGs for culling, because it is the fastest thing around. Several pro friends turned me onto PM for the culling speed using raw files, and I have to agree, the speed is amazing.
But there are a few user interface issues that could be improved:
1- While culling in preview mode, I have no feedback to let me know that I successfully tagged something. Or gave it a star rating, or a color class (the small real estate at the bottom of the screen is too far and too small to provide feedback; my eyes are in the middle of the picture above). Compare to Picassa: when I "star" a picture, a big star flies up through the picture. When I un-star a picture, the star flies down through the picture. No possible error.
A quick flash of whatever tagging / color / rating over the preview picture could solve that.
2- "T" key for tagging. Too small a key, lost in the middle of many other keys that feel the same when my eyes are up on the screen. My preference would be the space bar, but everybody will have different keyboards configurations and different preferences. So why not give the users the option to assign keys?
3- Picture counter in preview screen. Something that would tell me "you are on picture # 235 of 4,256". Right now all I have is the scroll bar to try to estimate how far I have gone.
I am a new user, so if there are ways of doing this that I missed, please do tell.