the only bad thing I've heard about Kubota engines is the noise. I have a buddy with a 3 cyl. Kubota in a trailblazer and I'll swear to you; this thing could wake the dead!! Flip side of the coin is he got 7000hrs with no trouble and to be frank, if noise bothers you, you're in the wrong line of work. I have the pro 300 with the 3 cyl. cat and I have had great luck with it.
Hope this helps.
GH Weidman