I actually drove over today (2.5 hours each way) to see the YM336. It wasn't in as good of condition as he intimated, for example, the bucket on the loader was really beat up -- I guess that's why the pictures he showed in the ad were from the side and the back.
Anyway, I decided it was too big and heavy. Compared to my YM1700, it was lumbering beast -- no offense, to those who have them, but I couldn't see myself pulling a mower with it. According to the data I found, the weight comparison is 1800 lbs vs. 3100 lbs for the YM336D (plus the weight of the loader if it's on.) I think I ought to stick with the YM2210D or maybe the YM2310D (2200 lbs and 2125 lbs respectively.) If I wasn't planning to mow my yard (and need to maneuver around some things in the process) it would be awesome to own such a powerful machine as the 336D.