Here's a shot of mine. The process included a "guard", and I went with a charcoal stain color. As you can see, it's kind of a mottled finish. I left the expansion joints unfilled, which gives it a bit of an industrial look.
It is still somewhat porous, even with the guard. In particular, I made a mark in it with a vinyl-backed floor mat. I believe that phenomenon is called "plasticizer migration", where the plastic in the mat migrates into the floor. Tires, depending on the compound, can leave marks too.
Water and other liquids will tend to bead up a bit, and give you a chance to wipe them up. It does help to be a bit of a spill-Nazi, though. Don't let things sit. I also don't live in an area where salt and major road grime are issues.
All that said, most of the minor staining I've experienced has kind of blended in with the mottled finish, and it isn't too bad. Even the floor mat mark is just a little bit of a frosty looking area. On the plus side, the floor is easy to sweep and mop. They guys who did the polishing told me that traffic areas can be re-burnished every couple of years if they get dull.
If I had it to do over, I might just do epoxy instead. However, a year or so after having the polishing done, it's holding up fine, and I'm reasonably happy with it.
