I don't think there will be any lack of things to complain about...
The first thing would be that there are almost no titles available that are not English. I usually read english books anyway, even though I am German, but my girlfriend is very unhappy that I can't buy or even "steal" German ebooks for her anywhere...
Other things will come up, I guess pricing issues ($=€) with device and books (a 9.99$ ebook should cost something like 7€ at a €$ rate of 1.4 but will most likely cost 9.99€, just like in iTunes) and so on...so I guess there will be no lack of things to complain about, but most of us over here would be very happy anyway...
