As an industrial and scientific professional, I rely heavily on quality casters to transport heavy equipment. The TWHN 50U G20 TN casters have impressed me with their smooth and effortless rolling, even under the heaviest of loads. I appreciate the durability and resistance to wear and tear, as well as the easy installation process... The only con I can think of is the slightly higher cost compared to other casters on the market, but considering the superior quality, it's well worth it..