We have the mat under a desk and part of it had to be slid under our bookshelf. It sometimes "bubbles up" on the corner. Quality is good for the price. The plastic seems very pliable. Our older one seemed a little more stiff but I don't know if that is better or not. It cracked after about six years of use (which is very good in my opinion.) Perhaps the pliability of this one will make it a better mat. I really can't say but I'll be happy if it also lasts five or six years.
I'm 180 lbs sit on a standard 5-leg office chair. Mat sits on a 1/4" deep wall to wall rug.Sitting still 15 minutes at desk leaves a dimple under front wheels that's difficule to roll out of. Totally unsatisfactory. I have already ordered a replacement(tempered glass). It's like the plastic wasn't cured. My previous mat was thinner and totally satisfactory but too small(3x4)- kept rolling of the edges. This one is almost 50% thicker(0.1 vs 0.145) but much less supportive. I was suprised - and dissappointed.
It stays in securely in place. I like the mat but the chair wheels leaves little indentations in the mat. It does seem to smooth back out after awhile.
Not as heavy as advertised on the tag in the store had to order one to be delivered this mat will fail in about a year. Deflects heavily on a medium pile rug. Check them out before you buy one.