We have a track remote control stump grinder with the same basic tracks as the zahan..
Not impressed at all..rips up grass reguardless...maybe the zahan is different but track machines IMHO suck on established turf. Green Monster like using "turf pads" not sure what those are but look into it..
I enjoy the 410 on all established lawns and new construction although sometimes it gets stuck in the woods or on the hills...
good luck...but I would stick with the 410