I play a lot of games, but Counter-Strike: Global Offensive is my main game.
I previously owned a Razer Deathadder, which I had for over 5 years, but then it began to fail so I bought the new Razer Deathadder Elite, which failed in less that 6 months of use. I decided to try out a different mouse, and after a little research, I decided to give the Zowie EC1-A a go.
If you've ever used a Razer Deathadder, this mouse is very similar in shape. The overall design is well done, feels durable and is comfortable in hand.
The only complaint I can really think of, which certainly isn't a deal breaker, is that mouse 4 and mouse 5 (The buttons of the side of the mouse) need to be pushed in a little more than I'm used to before they'll actuate. It's not a huge deal, but it's something to be aware of.
Overall, this is a fantastic mouse if you play shooters, MMO's, MOBA's, whatever you may fancy.