The mb1300 that I have is rock solid. It rolls very smooth and nice even loaded up with tools and a couple of truck batteries on the bottom. Once I got this cart, it started cart wars at the shop I work at and all the people that went off and got the big matco, cornwell, and snap on bits are starting to regret it because they just don't seem to be holding up very well compared to the mac. The big cornwell casters are garbage and have already started bending and the matcos drawer slides are broken already, and all but the mac sound like they are rattling apart while being pushed around the shop.