I have a bunch of Polachrome, and so far I've only shot and processed one roll. My batch expired in Sept '89, and it came out decent. I don't recall what EI I used, but knowing me, it was probably shot at box speed (40 ASA).
I have the manual crank processor, and the only problem I had was with the black layer (I have no idea what to call it); it didn't come off fully in the processor, so I had to peel it off. If this happens, be very careful - it will peel the image off along with it. I didn't try to soak it or anything, and I wonder if that would have helped (post processing, pre-peel).
As for the look, I think it's cool. Kinda has a blue-chrome look to it. I don't have any scans, because I find reversal film just doesn't scan well, and scans never do them justice.