I am currently in the market for a new walk behind. Since I already own a Walker GHS, I am considering the new walk behind by Walker. I need some feed back guys. The other mower I am considering is the Exmark 48/52 TTHP. I know the Exmark already has proven itself and I am concerned with the 15hp Kaw. on the Walker. I'm on the fence, someone give me a push!