Disklavier

Hey all

This is a great forum, so I want to pose a question to you gurus.

I have a family heirloom piano, its a zender small cottage style and 
lacks one octave of a full range. I havent yet hit this limit yet but 
in the next few years probably will (?). Whilst the piano has certain 
sentimental value (and would never be sold but passed on within the 
family), I am considering a disklavier (model DU1a upright) for the 
following reasons.

1. Its new and looks sexy :-)

2. Seriously, does the piano have a great value in learning, I mean 
some of the feature for example allow recording one hand then 
another, does this REALLY help in teaching process ?

3. Does the action of the Disklavier (whilst the unit is playing) 
prove to be invasive of the overal sound quality (I am one of those 
people with very acute hearing and unfortunately for me can detect 
all kinds of nuances - one example is on the one unit i have seen so 
far I am sure I am hear the solenoids whilst the thing is playing ;-)

4. When a "human" is playing, does having the disklavier hardware 
install affect the piano action (eg. DU1a vs U1)

5. Lastly software - I checkout the Yamaha site and whilst there is a 
number of software available, not as much as I would have thought 
from the classical side, example I am a keen Mozart beethoven lover 
and would like to see some piano concerto. On this line I have seen a 
number of sites that provide MIDI files for such concertos. Are these 
as good ? Certainly when I have played these downloaded files through 
my computer they dont sound too hot, any advice here ? Maybe they 
sound better on a "proppa" piano.

Sorry for so many questions, and I would appreciate this groups 
obvious knowledge on any / all points above !

Cheers

J