I'm a programmer myself, I've never encountered a situation where "00" would help me.
I think the double width keys always use a stabilizer of some sort like a bar, I like the look of that iOne with the extra keys, even though my SSK + that wouldn't be much of a savings in space, it overall will be handy for me.
I love my SSK, but not having a good numpad kills me sometimes.
I use a laptop always, when I'm at home in the US, I use a full-size model M. But abroad or working on a 1-3 week job, I might just bring my laptop, but it would be really nice to have a numpad that doesn't have a "00" whereever I go.