For the game, very pleasant!

As with any product, this mouse has the good and the bad, though, in my case, the negative points are without impact when I play, so somehow void.
First, I must explain that I am a faithful of the Razer brand and it was very difficult for me to take the plunge and switch to another brand. What led me to do? Very simple: It is unacceptable to pay much for a Razer, knowing that the lifetime of the latter rarely exceeds a year Anyway, I'm going to Logitech G600 (!). I already have the G11 keyboard the same brand which is a real treat and always works perfectly after 5 years of daily use: I took ca as a guarantee of longevity for mice. I can complete this review in 5 years to confirm, or not!
In short, setting a joke hand, criticize the mouse.
The main positive points:
1) The form: suitable for both large and small hands, and most importantly, does not impose specific position of the hand on the mouse. Placed his hand as it feels best, without losing features.
2) material: Genial touch! Very very pleasant. I have read reviews that say the slippery, I have not had this problem at all.
3) above the keys: There are three "under the fingers". Both with standard roulette therebetween, and a rightmost. Putting your fingers on top of the mouse and "snap" automatically to the keys that are very ergonomic. A true happiness.
4) 12 x lateral buttons. The surprise of the chef! They are incredibly ergonomic and intuitive. They are willing (front to back) in 4 rows of 3 buttons and unique fome of each button is unambiguous to the touch. This concept of form is really very intelligent. Example: The three buttons on the front row are hollow with the front of each button that goes back slightly, the lowest central that the left and the right, and the outer edge of those it up slightly. Conclusion, ca "wife" the tip of the thumb and touch, can not go wrong on which key. By itself, this concept deserves 5 stars.
5) The backlit keys. Many lighting this as being critical tuning. Personally, I have already on my keyboard and I appreciate enormously. A glance allows to check on what is pressed.
6) Place the hands on: Completely free. My husband who wanted to test it raises the index on the left button, the middle finger on the scroll, the ring finger on the right button and the little finger on the external button. I do not use the scroll and suddenly I decale my middle finger on the right button, my ring on the outside key, and my little finger in a vacuum, which allows me to stabilize my movements by placing it on the mat when I need it. The bombure also allows metter his hand more or less forward which is very pleasant to be able to adjust the thumb position on the lateral buttons.
7) Place the thumb on the lateral buttons: To start learning, I have the program easier to access and I accustomed myself in less than 10 minutes. So, I has been rapidemment other uses too.
8) Programation keys, save these profiles, recognition of certain games of assigning the functionality directly to buttons.
The negative point
1) key on the top exterior: It would have to be verified use, but while I play, it happens very often to me to click it unintentionally. It's a shame, but fortunately without any consequence because it does not triggered action in the game.
2) 2 small square buttons above are unusable while playing. Personally, it does not bother me because I do not have the utility.
3) With my little hand, and because I am not an alien, my thumb can not use the 3 buttons on the row most backward (G18-20). Fortunately, for the game I use (GW2), it does not bother me.

Conclusion: In my case specific, the 3 weaknesses of this mouse has no impact and therefore, the assembly is simply and purely positive. I do not put 5 stars because these weaknesses, although inconsequential for me are real negative points.