The ASV's look like nice machines and supposedly are the smoothest ride, but I'm told that their undercarriages are their weakpoint. Was told that they use plastic parts in the track carriage assemblies and they cost $12,000 to rebuild the undercarriages, blah blah blah. Any ASV owners out there care to dispute this or elaborate? I've seen several used units for sale that seem to be significantly lower priced than some of the other mfr's. Is there a reason for this? Are they a maintenance nightmare? Looking for insight on them! Thanks in advance!