We run a 502 and an 1102 almost daily. Biggest problem with the direct drive system can alleviated with proper greasing. Normally the bearing in the lower gearbox gets neglected buy the grease gun. New 502 lower was about $3000...you can rebuild them most of the time but its still pricey. We love out 1102. Looking to replace the 502 with a high horsepower self propelled, but havent found a unit we really like yet. Look for a nice used 1102 imho...plenty of power. 6 inches gone per sweep 18" down! machine is not that much larger either.