Portability is great, but not if it means flimsy. Other key features to look for are sturdiness and stability. The Mobile Project Center has solid-steel legs and rugged extensions that support the work surface when in use. Also look for non-skid rubber feet to keep the work center from shifting when in use, and for a work surface made from durable material. Particleboard tops can deteriorate quickly. The MPC surface is made from durable polypropylene.