Osage Beach,, MO
We bought three rolls of Diamond Nitro in early September. The order came quickly, and we began to install it "wall to wall". It goes down quickly and is very easy to cut and fit. Ours had waves in it from being rolled up and didn't lie flat, so we called to ask for a remedy. They told us to lay it out in the sun, which we did and that helped. One roll, however, still has a bit too much waviness, but part of the problem may be that the former owner had glued down some rugs here and there, and there is still some residue on the floor.
We left our rolls in the sun on mid-80s days twice. If you have this problem, you might want to wait for even hotter days.
We discovered that another roll had some bubbles in the top shiny layer and were afraid they would pop or tear. I sent three pictures to Rubber Flooring and they sent a new roll right away. I am impressed with their customer service.
One other consideration:
When the sun is shining brightly in our garage door, the glare from the flooring confuses the opener system and the door won't shut. I plan to raise the sensors higher on the garage walls and see if that solves the problem.