Frame very good, casters not. I would recommend "heavy duty" model for big blocks.
The frame is made in the US. That is a thumbs up. The casters are made in China. The quality is marginal at best. If you tighten the caster nuts more that snug the bearings lock up. Snug does not work, the nuts will loosen the first time you move it around with a motor on it.Thus making it difficult to maneuver. My solution was to purchase 4 Nylock nuts and torque them properly. It now works as it should. Would also recommend the heavy duty model for big blocks.