Got it this morning and just cleaned it now. It feels superb. Very smooth, light and crisp compared to Model M or Unicomp. It's also louder and more consistent. Of course it weights a ton and whole back is made of metal. The plastic case seems to be made slightly different than Model M. I think it has some paint coating on top of plastic - it can be seen on edges where there are slight tears in this coating (barely visible). The connector is indeed like AT and XT, but apparently it doesn't work with AT->PS2->USB adapters, but the seller said it worked fine with his XT, so to use it with Mac I'm gonna need some more sophisticated adapter like this teensy.
Here are some photos of it - my girlfriend took a camera to work so I made them with a mobile:
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