I installed these tiles about 4-5 months ago. They are great looking at about a quarter of the price of most others I checked on the web. You can see pictures of my garage at the link in my signature. Some observations:
1) They are not hard to keep clean and any good shop vac will pick up anything small enough to fall through.
2) They are easy to put together and the borders provide a little ramp so rolling carts around etc. isn't a problem
3) They do compress under heavy loads like a floor jack but I get around that by putting a 1/4" piece of plywood down under the jack.
4) When all linked together, a mat the size of mine is so heavy as to be unmoveable by one person. You can't just peel back a corner like one of the rubber mats.
5) You cannot turn your front wheels on them without them bunching up. In my case my garage opens onto a single lane alley so there is a bit of tooing and froing to get in straight.
6) The major disadvantage is that they do not drain well. In our recent snow storm and now "Pineapple Express" rain storms, the water became trapped and the humidty in my garage was 98%. Because it was cold, there was a lot of condensation on the slab. I've been running the exhaust fan and a portable fan for three days straight now and I spent about 3 hours with the shop vac trying to get the majority of the water up. I think I've got it on the run now though. I may consider putting the rubber mats down on top of the tiles though if we are threatened with more snow. Or, I could buy some more border tiles and separate the mat into two pads.
Would I do it again? I think so.