Ian,
With all do respect I find it very hard to swallow that your opinions of Yamaha's keyboards insn't somewhat biased due to being paid by them, and I wouldn't doubt that you get some other perks as well.

I can't help but wonder if you had the same set up from Roland or Korg.., would you then be praising them just as much....

Obviously your opinions related to Yamaha keyboards are heavily biased. Be realistic now..., would Yamaha want to keep paying you or giving you extra perks if you weren't always singing praise to them....