The package was so heavy it made me nervous! Super tightly rolled that it took a lot to unroll it, but it’s a really thick, heavy duty material and is perfect for under a heavy treadmill. If you’re using this to exercise on, as just an exercise mat, you’ll need to unroll it and leave something heavy on it to get it to stay in flat position without curling. But this was great thickness, protection level and even has a little give/cushion to it. Again not using as exercise mat, so unsure how supportive it is, but with the right weight holding it in place it seems like it would be good for just about anything.

I was in need of a mat for an indoor bicycle trainer that would replace an older one that had lasted for around 6 years before eventually breaking down. After researching several mats including some of the big brand versions, the Marcy mat seems to be the best balance of function and value.
Using a heavy Wahoo v5 trainer along with a bicycle and heavy sessions including sprints can sometimes be tough on the mats and so far it has held up well. I would love to do a longer-term report too. I see little to no difference vs the name brand, more expensive mats.
Plusses
– I like the shiny surface of the mat. It is easy to wipe up after a workout. My previous mat's surface tended to let surface liquid seep.
– The surface is grippy enough that I've noticed no movement to the trainer or bicycle.
– It's still relatively new but the mat has rebounded well to indentations from bicycle cleats
– The size in the extra long 78" is perfect for a bicycle, trainer and laptop stand
– I didn't get any smells when opening
– Unrolled easily and laid flat without excessive coaxing
– Good thickness for my needs
– While expensive for what it is (essentially a piece of foam) it is cheaper than name brand competitors so represents a better value.
Cautions
– Will need to see how it holds up to the heavy trainer sitting on it for long term and whether that results in surface breakdown.

Got this to go under new treadmill and protect carpet. It looks very sturdy and should do a good job of protecting. Appears to be 'oil proof' so hopefully no residue on carpet. It came rolled up and flattened out pretty nicely.
The only concern I have is that the treadmill feet (2" or so diameter) indent into this pretty strongly. The good of that: the treadmill will not slide around inadvertently. The bad side of that: you can't slide or pivot the treadmill to adjust line up. When installing, had to lift treadmill even for minor adjustments. One can work around that. You have a minute or so before it really digs in, but even so, it's hard to slide. Again – that's a pro and a con. I'm going to cut some larger wooden pads (4 to 6" ) to go under the feet to try to distribute the weight better. I've not moved the treadmill but I'd wager that those footprints in the pad will be permanent. That's OK – just don't be surprised.

Worked exactly as I hoped, opened it up and fit right under the treadmill and is definitely non-slip. I have run on it several times and don’t feel any movement. I thought it seemed a little thin when I first opened it (maybe a little thicker than a yoga mat) but the quality seems good, I think it will protect the floor just fine.

This item it gives a real protection when it come to exercise on the floor!! awesome and durable

It fits my WELLFIT tredmill. It’s thick and tough, was able to roll it out and do it with no issues. I brought the regular 60” size which is perfect!
The only thing it do take a long time to arrive but it’s worth it.

Great quality and works amazing under my treadmill