I call Ag leader, they dint say anything about used equipment. They did tell they had new one for $4625.00 of the PF Advantage had to have extra cable for gps and gps receiver GPS 1000 + for $799.00 then have to buy SMS soft ware for $600.00. Then I read this post http:__talk.newagtalk.com_forums_PrecisionTalk_posts_3226.html How had are they to calibrateIJ I got a price for fieldstar system part n 71395071 for the system then a wiring harness part n 71389828 but dint fined out about gps though Ag leaders GPS would work BUT the system cost more then Ag leader dose. Dont know how well it worksIJ Then I sow http:__www.loupelectronics.com_products_yield_monitor.html this one (I though it uses the same yield sender that the CAT usesIJ I dont know how well this works ether. I have a lot of question, how easy are they to calibrate for each crop and can you do part of one field then go back to it a week later and start recording data where left off before on that fieldIJ How easy is it to get data the home computer from monitorIJ Thanks Dee