I have been using this for a month and so far it performs as advertised. For your information, my computer is Windows 7 and my "mouse pad" is a 300 x 300 x 1 mm PTFE sheet.
Sensor: no detectable tracking errors at 16400 cpi, no detectable cursor drift or angle snapping, no acceleration by default (can be changed)
Weight: too heavy for me with removable weights but centre of mass slightly too far forward without removable weights, since the cartridge for removable weights is quite far back.
Feet: very slippery from day one to now. No perceptible change in shape or slipperiness due to wear, after one month..
Surface: different to the other kinds of non-slip found on other mice, but does its job. I don't recall ever having slipped my hand in this month.
Cable: the outer layer looks like and feels like nylon or some other kind of fibre which can be hold force. Feels very durable. Only problem is that its surface is rough and sometimes catches the edge of my mouse pad.
Buttons: Side button 11 is quite stiff. (requires about 4 times as much force to activate, compared to other side buttons) All other buttons click well. The side buttons are slightly angled so gripping the mouse tightly is unlikely to activate them by mistake, but if you angle the direction of push then not a lot of force is needed to activate the button.
Driver: macros you record yourself have a long delay when activated (about 1.5 seconds), making them unusable in games; standard actions (left click, right click etc) and built-in macros (triple click, Ctrl, Shift etc) have no detectable delay. Package comes with a small CD with driver software; it is also available from the official website.
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