Ok, so. I got the DeathAdder 2013 as a replacement for my Logitech G9x. And I've been using the DeathAdder for about 3 days now. I know it doesn't seem like a time long time to be judging the mouse that quickly but unfortunately it deserves the judgement. I'll make it short and brief.

Ergonomics
Razer promotes the mouse as being a mouse that has improved ergonomics compared to the DeathAdder 3.5G. But is it really improved? The only thing they've improved is adding rubber grips to the sides and went from glossy material on the side to a little more mat material. It's all nice and fancy they add rubber grips to the sides but it's totally retarded. Why? First off, the rubber grips will come off eventually due to hand moisture. And second, it doesn't actually improve your grip that much. It still slides off your hand if you hold the mouse loosely, which is something that shouldn't happen. But why does it happen? Because Razer was convinced that once they add rubber on the sides it will give you instantly better handling of the mouse. The reality is it does not.

But how should they have done it? Simple... they should've just used a Mat/Stone-ish material for the sides (Synthetic Plastic, just like the one they use on the G9x). Carve the sides a bit inside so the sides have a curve that goes inside. Like this:

So even when you hold the mouse loosely and lift it up, you'll still have the mouse gripped.

Then there is the design. It's not that great. One very crucial aspect of the design that actually removes a good amount of control is the curve of the mouse and the size of the mouse that comes into play. The curve's nexus point is too high. Which causes your wrist to lose control and forces you to use your elbow and the shoulder joint. Leaving the most crucial part of your arm out of use... your wrist.

Your wrist is practically elevated. Which is not good. Making fast turns with a snappy sharp stop is something that becomes more difficult to do now since wrists are mostly used to lock a mouse into its position. So since your wrist does not create the point of leverage you'll basically be forced into unnecessarily making your entire arm do the work, inefficiently.

I have a philosophy for mice that I always go by. Which is: Does the mouse, make you conscious of the fact that you are holding it in your hand? The answer for the DeathAdder is YES. It does make you conscious of it, which is again. NOT good!

When a company is creating a mouse, they have to aim towards a design that creates an almost invisible medium between your hand and what is happening on screen (the cursor, not porn). The users intention to move the cursor to another place should be felt like as if the hand is almost seemingly giving the orders and it should not feel like you have a proxy between the cursor and your intention (hand). Which DeathAdder does do, it makes you so damn conscious of the mouse that it feels like the mouse is screaming for you to conform to its rules instead of the other way around. Why does that happen? Well the curve design and the size...

See just because your palm rests on a mouse completely does not make it a GREAT, awesome, revolutionary mouse. There is no blending and becoming one of the mouse going on here when your hand rests on the mouse completely like that. As much as it looks nice on a picture to see a hand completely wrap around the mouse, in reality it just makes you restrictive in your movements for obvious reasons I mentioned before (Curve's nexus point too high, wrists do not have a leveraging point anymore).

So the size, is too big as well. Now you might say that my hand is probably too small for it and that the DeathAdder is for big-sized hands. To which I respond: the size of the mouse is so big that it would probably suite best for giants... literally giants from mythical stories where they come out of caves and shit and start eating animals.

Palm and Claw grip. The thing is, claw grip IS the best grip and is also the most healthiest grip for your hand. A palm grip is not a natural resting position of the hand. You can simply see this by taking your hand, and relaxing the fingers. To what position does it fall? Yep, a claw:

Same reason when people go to their first piano lessons that they are taught about the right and correct positioning of the hand. It should look like as if you are holding a pool ball in your hand.

With the DeathAdder, there is no space for you hand to stay in this natural position (Unless you are a giant and have humongous hands).

The rest, as far like the tracking goes and everything is fine with me, can't really say anything about that.

So overall... ergonomics is the biggest issue with this mouse. And this commonly used design in many other mice is probably the worst design you could ever have for a mouse... Next time when you pick a mouse, pick a mouse that is small with good gripping. Don't pick oversized mice, you won't feel like you're a sniper. You'll feel like a kid in oversized clothes. Unless you like to play CS a lot then you probably won't be able to really face the problems of the design that much since that sort of game relies on a lot of horizontal movements.