I've been using this mouse for at least two years now, maybe more, and I continue to be very happy with it. I bought it first because I was feeling symptoms that seemed to prefigure RSI - tingling in the little finger, aches along the forearm. I got an Acer split keyboard, this mouse, and a mousepad with a wrist-rest, and the symptoms went away. I don't know whether to attribute that to some or all of these three solutions, but at a minimum I've got used to the mouse and now intend to get the optical version.

It takes a little longer to get used to the mouse than the couple of days claimed by the manufacturer, and in truth I don't think you can ever get quite the same degree of fine control as you do with a conventional mouse. Having said that, you DO get used to it, and it is more than accurate enough for non-specialist PC use. If you need super-accurate pointing - maybe in graphics editing, for instance - I suspect a conventional mouse would be superior.

Using the mouse correctly takes some self-discipline at first. The manufacturer stresses that you should NOT rest your wrist on anything while actually using the mouse: your arm should be doing the work. Double-clicking with the thumb takes a bit of work too, and I have a feeling that holding the button with the thumb for longer periods (while dragging, for instance) isn't such a great idea ergonomically. But the same probably applies to holding the main button on a conventional mouse.

In the wrist-neutral position, the front-back axis of the mouse isn't aligned with the forward-backward axis of your desk/mousepad. To compensate for this angular offset, you need to adjust the pointer motion through the software, and this takes a good deal of trial and error adjustments. In particular, I found initially that when scrolling through long documents by dragging the scroll bar, the pointer would 'jump the rails', i.e., diverge from the path of the scroll bar, thus releasing the scroll bar and causing the document to jump back to the point you were at when you started scrolling.

There may be something in the previous reviewer's comments that this mouse redistributes the strain rather than relieving it. But (a) I find it hard to imagine a solution that eliminates strain altogether: I presume the point is to have the strain taken up by less vulnerable soft tissues; and (b) if you use it as recommended - with the arm doing the work - then presumably this is what is happening. The trade-off is decreased accuracy; but I found after a week or two, this was no longer a conscious issue for me, and this has remained the case. As to the sweating problem, I haven't experienced it.

I can only say that the RSI that I feared has not come to pass. I can't say for sure that I have the mouse to thank for this. And I can't rule out the possibility that some other RSI problem will rear its head at some point. But it hasn't happened so far.

Recommended: Yes

Amount Paid (US$): 50? 60?