hey, i need some quotes on the mowers listed below. im planning on selling my walkbehind and getting an exmark hydro. ive got a belt drive and i test drove my friends viking hydro and i loved the controls. on my mower you can only go forward, but with the hydro, you have the true zero turning radius. Has anyone used the turf tracer hp/ turf tracer. what was/ is your experience with the machine? thanks FMD524 FMD604 THP19KAE523 thanks exmark!!!!