I bought the EeePC 701, and then moved to the 9" 900 model.
I thought the EeePC 900 was perfect in size, footprint and weight, but the keyboard was a little irritating for prolonged use, and the battery life at less than 3.5hrs (I had the 5800 battery) was not ideal.
The NC10 although larger, is more stylish and grown up looking.
It is heavier, but still acceptable and the larger (and nicer) screen means there is a larger footprint.
I used my EeePC everyday, and the NC10 with the far superior battery life (average 6.7 - 7hrs) has won me over, and I don't need to have it plugged in everyday.
The 10" screen is a good size, especially when it enables the keyboard to be a more useable size, and it is very bright and clear.
It comes with Windows XP Home, and coming from the Linux OS on my EeePC, it does seem a little slower, but overall it boots up relatively quickly for a Windows OS.
I have a black unit and it has the fingerprint-magnet shiny finish, but that can be fixed with a microfibre cloth if it bothers you. I'm OK with it as it adds to the machine's good looks.
This is a great all round machine and I love it.
Stylish with great keyboard and battery life.