Great questions. The Z915E is a good machine. I would recommend it if you can't fit the Z930M in your budget. Both models have similar horsepower, but the 930 has a Kawasaki engine and has a suspension seat option. The Kohler does have hydraulic lifters, which create more engine noise, BUT you don't have to adjust the valves, since the lifters do that automatically. The Kohler, even though about the same HP as the Kawasaki, has a different torque curve, and tends to bog down and take longer to recover in high, thick grass. It all depends on your budget and mowing conditions. Most of these Kohlers fail because people buy the Z915E because it's the cheapest in the Z900 lineup, and then they work it to death. But for someone who is only mowing their own property, and if you keep up with your grass, it will do fine and give you many years of service! Hopefully this has helped answer your questions! I work at a dealership and have 23 years of experience both as a technician and in sales for Deere equipment.
