about 15 years now. 2 lifts in the garage, a 4post and a scissor (md6-xp), I was worried about the scissor damaging the tiles and it did first time I used it, the casters on the moving end had sharp edges, I radiused them on the lathe and no damage since. My table saw (Unisaw) can leave a dimple on them sometimes, but it goes away a day later. Its a 3-wheel moving platform, 2 wheels at the back and at the other end one swivel wheel, that one wheel gets all the weight on it with its down to move the saw, if I put it up so saw is stable then nothing happens to the racedeck. I have only damaged a few times and most of them were with MIG or Plasma cutting, I now have a small section where I pulled the tiles leaving bare concrete to do my welding/cutting. I restore cars and do all my own car work on my modern cars as well. Pulled quite a few motors, gearboxes, etc. and made quite a mess on the tiles, they clean right up.
I saw the comment about scratches at around 10 years, mine are 15 and still look good to me but I have used the Racedeck cleaning and renewal product twice in that time.
I had the tiles down in my old garage about 10 years, pulled it up when I moved and was shocked at how little oil had made it to the floor during those years and I spilled a LOT of stuff on that floor working on my FJ I had at the time, basically only one small area under the 4post had any oil that made it through the tiles. Best part was the floor looked every bit as good as the day I put the tiles down. Second best part or tied for best was my new garage was bigger and I was able to purchase new tiles (remember this is 10 years later) and match up perfectly with the old tiles in my new garage. Floor had been poured only 2 weeks earlier, I didn't pain or prep the old floor beyond sweeping and I did nothing to the new floor also.