Bought these mats to cover my bonus room above the garage. They work well and don't have any rubber/plastic odors that I noticed. They fit together fairly well but some of the edges are not 100% flat. It's not really that big of an issue. However, I docked one star because a lot of these mats had some type of oil or grease that smelled like WD-40 on it when I took them out of the box. I needed to give these a good mop down. They are 1" thick and are firm enough where you can balance on one leg without feeling like you are sinking in to the mat. I don't suggest putting furniture or anything focused on a small point on these mats as they will indent and possibly puncture. I put wider slider feet under the legs of a coffee table I have up in the room. Served my purpose well. Would suggest this product.

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.

I like the thickness of the mat. The color is nice and muted being gray and black. It is versatile as you can do solid, striped or a checkered pattern design upon installation. This turns a cement floor into a play floor for a child. Not as fall protection for a slide or raised structure. Rubber would be needed for that. The size, thickness and cushion this mat provides is worth it to buy it. No smell. Arrived quickly. It is a good product.

Everybody in my house loves these.
I laid them in the living room, when not used, I put a blanket over it so that we can walk.
I have my big ball and every time I feel a need to test out a new move, I don't have to wait for Next week's class, I can just do it here. I can do my conditioning training and drills at home, and at the dojo, focus on techniques.

What a smart investment. I'm not sure if Judo take-downs will be fantastic with one layer of these, but if you put two layers it's super supportive. Jiu Jitsu drills are very comfortable on the mats, and Yoga is amazing. Now it's stretch and hold, instead of Stretch and the body resists due to a hard floor.

Today my cat one upped me in yoga on the mats, after watching me do BJJ drills

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.