They seem to be the iron horse of the series. Using mine since 2004 with adequate maintenance, have never had a problem in the 600 plus hours of operation. Hydraulic capacity is good for using a loader and the 60" MMM works well in tall grass trimming around trees where the tall grass is cut twice a year. Very fuel efficient and a perfect size to operate in tight areas.
I would like to update but I don't see an advantage in a newer model besides a fancy hood / grilles.