Disklavier

Hi to everyone,
after 1 year spent thinking (to buy or not to buy...) I am finally
ordering the mytical disklavier.
I'm still in doubt if choosing a DC3 MarkIV normal or Pro.
For what I red differences are very small.... 
- some more precision in very rapid touches for Pro
- built-in apli and speaker for the DC3 MarkIV 
Price is more or less the same, but they need 2 month to process the
order for a DC3 MarkIV and 4 months for the Pro one.

So the questions are:
Is there other changes between them?
Someone playing DC3 MarkIV noted some rapid notes missing or changes
in the sound in the playback?
Suggestions?

You know.... two more months waiting for it are hard to pass!

Thanks in advance for any comment

Roberto