Been putting in about 6+ hours a day and still enjoying the tractor. Put the mower on and hit the steepest hill—all tractors in 2nd gear before the Yanmar would stall if you kept it floored. The Yanmar will bog down some, but I can keep it floored. At the top, I'm above the trees, and at the bottom, below them, so steep you can only go down safely on the left side to avoid sliding. All other tractors, including the 4075R, with a +17 hp, could not do it. Today we hit 90°F, the AC works well, and I was comfortable. But I have yet to sit in a tractor that beats the AC in my 4230. Cab noise level is on par with the 4075r; it's louder on startup, but once it's warmed up, it's very quiet at 540pto rpms. No need for ear protection that was required on the Rk55.