We're looking to purchase a new higher efficiency aerator for use on 500-600 properties (8-12K sq. ft avg) this fall. We're looking at two models in particular: the Lawn Solutions Ride on Units and the JRCO 60" Hydraulic tow behind unit (for an Exmark or Dixie Chopper ZTR). I've reviewed some of the info on each manufacturers websites and they look like comparable machines. One is stand alone (Lawn Solutions), and one is an accessory/ add on. If you own either of these units I've got a few questions: JRCO 60" Tow Behind Aerator 1.) Can I aerate at mowers 9-11 mph cutting speed? 2.) Can this unit sufficiently pull cores from tough soil (i.e. high clay/ low moisture content soil) 3.) How often do the tines need replaced? Lawn Solutions Ride on Aerator 1.) How does this unit hold up over time and what repairs can I expect and at which intervals? If you own either of these models I'd like to know how well they work.