Used this on bare concrete floor in unfinished basement. I'm pretty big at 6', 240lb, and I'm using it for p90: pushups, burpees, jumps, etc - all the plyo stuff, including yoga, that you'd expect would drive these tiles to seperate. Nada. Holding together strong over a couple of weeks now with no signs. If suspect that over time it might be necessary to tape the underside of the seams together, I mean, I have to imagine that they won't hold up forever (maybe I should just do that now as a preventative measure?). But so far, they have taken some abuse with zero issues.

I was really pressed to find clean, non-toxic, non-gassing tiles since my wife is a nut about it. These are fantastic, I did a lot of research on it. I'm confident and comfortable with this purchase...and it's half the price of competing brands that couldn't make the same claims on toxicity/safety.

If I demolish these things, you know what I'll do? Buy another set.

I ordered a quantity that would cover a 14'x14' area, and they were very easy to lay down and link together. On any surface, they'd be good for stand-up striking and footwork. On a carpeted surface (which is what I have them on), they're sufficient for take-downs and rolling. The only issue I've encountered is one that's not a product issue, it's just implicit with the design of pads that link or interlock: if you step, toe-first, on the border of two, your toe may slip under, or it may pull the interlinking tooth out of place. This is an inconvenience that can be mitigated with mat tape.

I bought a dozen of these to set up a small area in the garage for my wavemaster. We have a finished garage floor that is fairly slick. The tiles go together easily and so far are staying together.
Important installation tip: EACH tile comes with border strips on two sides, so you have plenty of border to work with. The trick is, they are not all on the same sides for all tiles. I know that sounds funny, as they are squares, but lay them out and you will see what I mean. So its worth doing the layout without connecting them first, so you can plan for the borders and not have to do as much rearranging to get the borders all set.
PRO: They are a good thickness for stand up workouts and have the tatami style surface texture. They have so far stayed together well even with me kicking and punching the wavemaster all over the place. If you are a kicker, they aren't too sticky, so you can get good pivots on your round kicks while barefoot. And the mostly full wavemaster doesn't slip around too much under use. However:
CON: well sort of con...they are on the verge of being too slippery. I'm okay on them barefoot, but if you are wearing socks, you will find yourself on your rear end in a flash. Also, the assembled set of 12 slid around on the garage floor quite a bit until I added the heavy wavemaster. So you may have to deal with slipperiness on the bottom side as well depending on the surface they are on.

Not really a con, just a tip, I don't personally feel these are thick enough by themselves to be appropriate for judo or jujitsu training. Unless you actually like being slammed into hard surfaces, there better mats for ground work.

Used this product to cover baby's play area. Firm enough that the baby can crawl and walk without issues, but soft enough to prevent injury, if the baby falls down from attempting to walk.

Likes: Better bargain and lower cost than advertised baby mats. Multiple uses. Easy to clean. Easy assembly. Durable.

Dislikes: Don't expect it to look pristine if you have pets or after the baby is done playing with toys on it. It will get visible scratches pretty easily, but the flooring is still durable.

I'm glad I did my research. These are what I was looking for. They surround my garage gym rack. I used them for plyometric push-ups, planks, abs, handstand push-ups, etc.... I place my 45 bar on them when I need room in my rack. I lay 45lb barbell weights on them in between sets. So far, they are very durable. *I ordered 6 and liked them so much I order 6 more. I received the wrong pattern for 2 out of the next 6 and the company send 2 more replacements immediately and told me to keep the wrong pattern tiles. This happened two more times. Their customer service was awesome. They kept sending me tiles until they got it right. With no returns. I am super happy with the product.