Thanks again for the visual Mediterranean. I'm still mulling this over. I like the space conservation of the 73, it actually ends up being 3 inches less than my Studiologic VMK 188, which is 52 inches versus the 49-ish of the Kronos 73 key. The 88 key ends up being a little over 5 inches longer and an inch deeper than my VMK 188.
My only beef with the 73 key is the sort of odd cut of the 73. It chops off 7 notes on the lower register and 8 notes of the upper register. I really wish they'd just chopped off 15 notes off the upper register and left the lower range intact as it would be on an 88 key piano. I certainly use the bottom octave more than I use the top octave..... and I don't think I'm alone in that ...... couple that fact with the key's I generally play in (B minor, some modal version of that, and D minor and a modal version of that), it's kind of weird for the 73 to cut E1 to E7.
I might be nitpicking though. I have to play through some of my piano based songs and see if it would be an issue.
Why do people always assume the tonic will be the lowest note? The lowest note is just as likely to be the dominant (in B minor this would be F#), or it could just be some other note. In any case, if it bothers you, you can just transpose the entire keyboard down an octave.