The Vanguard engine is a joint venture with Daihatsu and Briggs. I had the same engine on my BadBoy CZT 42" I recently sold. The engine was smooth and plenty of power and as you said, it sound really good!! I do wonder if it may be a bit underpowered for a 60" deck, but I think you would be fine. It would be nice to hear from someone that has owned or owns this machine to get an idea of the power in the tall grass.