Actually I not too long ago bought a mx518, and before I did I did look up some info on it.
And the current MX518 is incidentally a 'new' incarnation introduced in 2007 with a new sensor.
As for my view: I like it although I must say I myself never used the DPI switches in any game, and the rubber covering is too thin to last long, already it's worn away on the side, but that doesn't matter much for me really, although aesthetically it obviously doesn't do it favours.

It's nice that you blokes at the Inq encourage people to send in links to their hardware reviews, but perhaps you should be a little more selective? The MX518 has been out now for several years, even if it is a good mouse compared with more recent offerings from Logitech. I have a lovely Pentium II 350MHz knocking around somewhere. It's the first CPU to support a 100MHz bus, but I don't suppose anyone would want to see a review of that.