Hi guys, my 2 cts....I bought a BMII in 1982 with 2 hp ,,,still running , bought a BMIII in 2003 with 2hp Variable slow speed motor.....definatley a slight learning for me as the new machine was much quieter and smoother running...I even called the company and asked if its too slow at top speed...i listen to my machines for differences. It has saved me some pain a couple of times before so marked differences in grinder hum was a noticable aspect.
Bj