Bests & Worsts Reviews from Amazon

I bought this to use at work. It came rolled up and was curled from shipping, so I laid it out weighted down with heavy boxes for several days, hoping it would flatten. While it did flatten some, it is still lumpy and I'm not sure which is better, using it or going without. If they're going to ship it rolled, it should be of a quality that it will flatten. Otherwise, it's just a waste of money.