Well...in the end they really sold more in Europe than in USA! :lol
It's good seeing that there seems to be an upward trend since last weeks saw a rise in units sold per week.
Moreover, since they said to have reached the one million mark just one day after the price cut, this means that 3DS sold about 500k in one month and half, after having sold one million in 4 months and a half...with an upward trend in these last weeks. Not bad, and similar to DS in regard to total numbers, IIRC.
Talking about US...eh, in September it decreased a bit in every week, but not in a dramatic way, so not as the DS is doing. 3DS should obtain to eat even more in DS territory this October, stabilizing, or even going a little up in weekly sales.