My son and I like this machine, It is very nice. The tension pull is very accurate. After we sting a racquet, we use the tension tester to verify the racquet tension. It matchs the tension setting on the machine. We have it over 2 years. We already strung lots of racquets. I usually string about 15-20 racquets a month. So far we already strung over 500 racquets.