Hey – I got Opera Mini on my 6600 (which I got back) and it works just fine on it. The screen is larger so it can fit more text on it, and its just as awesome as on the 6280 š
It takes a bit more time to get it to start then the Symbian native Opera version, but not by a lot, and for short browsing sessions its much nicer to use then either the builtin browser or the Symbian Opera version.