ExMark is nice, but Skag takes it up a notch. I looked at both and they're similar. But Skag basically took the ExMark design and improved upon everything that's important - bearings, sheet steel thickness, etc. Of course, both are commercial machines so I doubt either would wear out from normal home lawn cutting anyway!! Mine's a blast to drive - it'll do 10MPH (19HP Kawasaki) and I've got a bit of a 'road course' laid out between the trees ...... sometimes I think I should have a helmet on .....