What is heaven on earth with a cable attached to it? What makes my cursor move so smoothly that it makes me cry that I want to have babies with my mouse?
only the 3360/3366 is that sharp. but the there are a lot more mice available with the 3310..
it's likely that there's a 3310-mouse that has a good shape for you, but if you want the 3360 then you will have to be lucky that any of them are a good fit.
well.. there actually are other(older) sensors that are quite good as well, but all of them have issues or otherwise shortcomings. things like very limited cpi-steps (sometimes even fewer non-interpolated steps), angle snapping, jitter, low perfect tracking speed, etc.
anyway:
the 3310 has higher motion delay and higher "variance". meaning the 3366 is basically more accurate, and faster to respond.
the 3366 has higher perfect tracking speed (though the 3310 is already high enough for 99% of the gamers).
the 3366 is capable of almost twice the fps (12000 vs the 6400 of the 3310) potentially making it a lot more smooth, but this probably isn't really something you'd notice. :-)
in the end, the 3366 is really just a straight upgrade to the 3310, but right now you have
very few options if you want that sensor.
the 3310 is still a good (enough) sensor, though. personally however i wouldn't buy a 3310 mouse, simply because i know that there's something better out there. :-) but that's just me