Hi,
I like on-board speakers because the KB stays put !!

I would use the KB for home and studio use , so weight would not be a big problem.

I defiantly see your point and it`s a good one , a lot of people make there living by playing out and giging , I did the same a few life times ago , so I know where you are coming from.

But for my use , on board spkrs works best for me,

That is not to say that a Tyros 2 is completely out of the question , still thing about it.
But when you consider the cost and the S900 with almost the same stuff ,( lack build quality ) it`s really hard to justify the added expense of the Tyros , but after trying the Motif XS , I really like the action and the quality build and if I`m not mistaken the Tyros 2 has the same build quality as the Motif XS. I know it has the same key bed.

O__ well , more sleepless nights !! LOL

Gary