I think Yamaha has it wrong!
They are asking the wrong question.

What they should be asking is if the Tyros 2 (with all the features and sounds) had 76 keys and was less than 35LBS, would you get it or would you consider another brand.

I am sure that ALL of the currant Tyros 2 owners would still get it. Since all of the hoopla about the Tyros 2 is about the sounds and styles. In addition, Yamaha would get even more sales from the people who want and need 76 keys and who absolutely would not buy a Tyros 2 in its present 61 key condition.

I can guaranty you that if 76 keys were so disliked, Roland, Lionstracks, Wersi, Korg and Ketron would not be making them.

Yamaha had a perfect chance to totally dominate the arranger market and leaving no room for the competition if the Tyros to had 76 keys. Remember it is the sounds and styles that sell the Tyros 2. Because the sounds and styles are excellent on the Tyros 2, having it weigh an extra LBS would not have decrease sales.
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TTG