I've come across a gravely Pro Aire 27 core aerator that is in almost new condition. I've done a little research on it and it listed for around $2500. I can probably buy it for around $1000. It runs good and is very clean. I don't see where it's an item that gravely makes anymore. Does anyone have any knowledge of this core aerator. Is it a good, reliable machine? Were there any problems with it for them to stop producing them? Any information would help me. Jon.