Pros: Was the best there was for a very short time
Cons: The shape make either of the two side-buttons useless Product was immediately replaced by the new 5600 DPI model. Never got to make it work on Windows 7 x64 A lot of driver-software and firmware came out
Summary: I was expecting so much more from this mouse! Bought it to replace an older mx440. The tracking is excellent, and the main two buttons and wheel work flawlessly. Also, the software is great and installation is a no-brainer. But it's hard to grip properly, and very hard to move without hitting the side buttons. I had to completely disable two of them (one on each side) just to be able to play Quake properly.
Summary: This is basically a great mouse. It worked very well for nearly two months. The DPI switch is great for when you have some older games where you need a lower DPI resolution. But here comes the big let-down: The (rubber) mouse wheel started slipping in under two months of use (which means it slips when you scroll it and therefore doesn't result in any scrolling on the screen)!
Summary: The thumb buttons were a little too far back towards my palm to use, and unlike the copperhead, this mouse had a much higher profile. It just feels too high, to the point that i started using my old 20$ logitech mouse again.
Summary: I bought this expecting top of the line and all you could want features, but... It's a solid mouse, don't get me wrong, but it's not really that special. You could probably find similarly performing mice for much less. I paid $80 for mine and then found out that I couldn't even customize the buttons exactly like I wanted to.
Excerpt: I loved this mouse generally, but it had serious quality issues. First off, the plastic cover on the illuminated mouse wheel would slip. Apparently it's just pressure fit, and it becomes loose over time. This means that the wheel doesn't work any more. I tried fixing it by sticking some...
Summary: love the high dpi, had to turn down sens a little bit so that the mouse wouldn't move every time i went to make a left click! reason for the 3 stars is because the LED light on the palm spot of the mouse flickers slightly when it gets to the dimmest it goes (the light pulsates bright and dim, bright and dim).
Summary: The mouse is a little light for my taste, and many 'gaming' mice now have optional weights, which this one lacks. But the big off-putting shortcoming for this mouse is the lack of a visual indicator showing the current DPI setting of the mouse. There are buttons to change the precision of the mouse on-the-fly, but you have no way of knowing what your current setting is, which makes this difficult to use in practice.
Summary: In my experience this is a good mouse depending on the game you play, how you play and what surface you play on. If you are low sensitivity this mouse is no good for you. It doesn't seem to be as accurate as my Diamondback 3g when making sweeping turns in my fps games. If you are mid-high sensitivity this mouse is EXCELLENT!. I couldn't notice any tracking inaccuracies when playing at higher sensitivities. Everything was silky smooth. IMPORTANT!
Summary: This mouse has great DPI. Well, also the right side-buttons are easier to press than my Razer Diamondback's. Also the sensitivity change buttons below the mouse wheel are nice. Razer's drivers and software are both very buggy, and as far as I can tell they always have been. Ever since I bought my first Diamondback, I have had occasional blue-screens of death due to razer drivers. The same goes for this Lachesis on a fresh install of windows XP.