Just my 2 Cents (thats all it is worth anyway) the STAB Motors were the best motors. As a FTA equipment dealer i have sold a lot of different types of HH Motors over the years and the STAB was the best. We had literally 1 return in hundreds sold. The SG2100 was the 2nd best as far as quality and reliability. The old SG6000 was probably the 3rd best. The SP120 not much data on that one, we only ever had 24 pcs of those.