It all started when I got kinda bored of my wmo. It's a great mouse, no doubt, but I just wanted something else after years of use.

So here's my quick take on it.
I cannot comment on the build quality yet since I've only had it for a short period now, I am however concerned about the cord. It's very thin and I've read several complaints about it. The upside?
Logitech will gladly replace it. Their customer service is pretty decent.

What I really liked (coming from both mx518, wmo and ie 3.0) is the ease of use and plug&play settings.

Just plugging in this bastard without drivers whatsoever will instantly grant you 1000hz and prediction off*
I know setting 500hz via hidusbf isn't a hard and time consuming task, but knowing that I can plug this baby anywhere without fiddling around with too much settings feels great.

I've tried several mouse grips.**
The Claw grip just looked wank, my ring finger barely fit. I didn't like it that much.
Palm grip felt natural and is what I'm currently using.
Fingertip grip felt awkward but apparently some do use it

Weight seems fine but my wmo felt a bit lighter.
Addendum: No, I will not drill holes in it. Forget it.

Skates are same size as mx518 and they feel ok for now, will update when they wear out.
Scroll wheel works ok, it's not the best but has very distinctive "rotations", far better than anything wmo had.

On-the-fly DPI switch is here with standard 400-800-1800-3000 settings, you can fine tune it with drivers if you want something in between 200 and 3000.


So far I'm very satisfied with the purchase.
It's a bit more expensive than your standard wmo, a bit cheaper than your IE 3.0 and a LOT cheaper than anything from steelseries, zowie and similar brand names.
I wasn't able to find a legitimate MSRP, but my guess is ~33€/35$

All in all I'd say go for it if you're looking for a replacement. Can definitely be called mx518's bigger, smarter and more efficient brother.


Here's a few pics:
Box
side
Size comparision with IE 3.0 (don't have other mice at home atm)
Code


*Older version has prediction enabled, newer version doesn't.

New version indicators:
- LZ higher than 133** (mine)
- If it does not have a PID but has a S/N of ANY number then it has no angle snapping
- New ones have a round logitech sticker on the box


**grips may differ depending on the size of your hand and preference


Lousy reader version:

A great mouse with a flawless sensor, no prediction, decent build quality (except for the cord) which comes at an affordable price.


Even more lousy reader versian:
Lol get dis mouz is rly god I like XD