You can't middle click??
I got my first one in the mail yesterday and thought it was defective when I couldn't use the middle click. I instantly assumed it was a mechanical defect because clicking the scroll wheel feels kinda funky (the kind of feeling that would make one think it's broken). I installed the logitech software hoping to remap buttons so I could make left button + right button = middle click, but the option wasn't there. In my desperation, I put in a replacement order on amazon.
I get the replacement this morning and I was filled with excitement. I hook it up and quickly press the middle click button with this whole "i'll show you now, defective unit" attitude. Much to my dismay, I find that this one also has that funky feel when you press the middle scroll wheel. Now, I was sure I couldn't get two defective units in a row so I looked into it. Apparently the middle scroll wheel can only be used to change from "frictionless" to normal scroll speeds.
NO MIDDLE CLICK? NO WAY TO REMAP THE BUTTONS TO DO A MIDDLE CLICK? WHAT THE FUCK!!!!!
Review = 0/0 stars. When tabbed browsing becomes difficult is when I realize the terrorists really won and the recession is really a depression.

Now I have two non-defective units.
:suicide
Drinky, I trusted you !!!!