I bought the least expensive and so can't complain but it's so thin I already see impressions that won't ever come out and might begin in the not too distant future to crack.
The chair mat "walks" with use the cleats or studs do not extend out far enough to prevent it from walking across the floor. It says for carpets up to 1 inch but would only work on very short pile.
Good size but When put on carpet even a somewhat firm carpet the plastic dents and doesn't let my chair move well. The wheels get a bit stuck in the plastic which becomes dented.
First I have to say that the 48" dimension included the lip which is not what I expected. Next the mat does dimple with my 185 pound weight. If this matters to you then don't buy this mat. Spend the extra money and get a better one.
This delivery was delayed a few times but when it arrived I was very satisfied. Compared with my previous mat this one lays flat and my office chair rolls easily over it without too much shifting. However I find it dents easily despite my less than considerable weight (<130lbs). This is probably in part because I have rollerblade wheels on my chair so the weight is concentrated on a smaller surface. For the price well worth it. Was delivered flat so no need to worry about uncurling.