I have had the Naga Epic or w/e for a while. It's a badass mouse.
However, I don't care for arena and I spend my time in WSG. This may not the best mouse for that and I will tell you why. If the mouse is not 100% snug in your hand, when you go to press a button with your thumb, the pressure will move your mouse cursor. In BGs you're not using target party member macros, you're using mouseover macros. When you're trying to mouseover someone at the same time as pressing a button, chances are you're your accuracy will be lacking and you could miss a target.
For healing It's easier to set your mouseover flash heal for example as 2 on your keyboard and use your mouse freely hovering over characters than also hovering and also pressing 2 on the side of the mouse. Accuracy can severely lack when you're pressing the buttons on the side which is why most people use this mouse for arena where you are using target macros and not mouseover macros.
This is just what I've found while using this mouse for the past year or so. I know some people may not have these issues. No doubt you could tighten up your cursor speed but as a healer I always prefer faster cursors.
If you're doing 2v2s or 3v3s and using target macros, you'll be absolutely fine. If you're looking to do mouseover macros, it can really mess with you so most of my mouseover macros are still on my keyboard.
As for the scroll clicking speed, any mouse is going to have a great scroll clicking speed.
For clicking flags however, I've found that using abilities on your mouse while trying to scroll click a flag can also result in a lack of accuracy the same way a mouseover macro can. It's essentially the same thing, pressing a button on your mouse while hovering over a small target location. For any lock on casting, PvE, Arenas you'll be fine with this mouse but if your main thing is BGs with mouseover macros, you may not gain an enormous advantage.
I do still use this mouse and I love it however. I've blinded most of my mouseover macros to keyboard. Personally, I would consider the Logitec version of this mouse as sometimes my thumb can get lost on the keys. The Logitech comparable model has slanted buttons so it's much easier to make sure you're in the right position. On the Naga there are slight bar raises on the bottom of the keys in the 2nd row and 4th row (similar to the raised bars on a keyboard on F and J. Personally, I don't notice these often enough.
https://www.youtube.com/watch?v=JE6Fp2qi-Qw
Edit: Another thing about Razer mice is they are designed to break with use. The scroll wheels on Razer mice have 2 white plastic tabs on both sides of the scroll wheel and that's what makes the tick noise and feel. They usually break down the road and most people who buy a Razer mouse often have to replace them down the road due to a scroll wheel going dead and free scrolling with the sensors broken so nothing can be registered from the usage of the scroll wheel. I'm sure all mice have similar hardware, however, I know that I don't trust the Razer hardware.
With that being said, when I got the Naga on employee discount for cheap I made sure I was covered for 2 years on it so I decided to go with it. I'm still somewhat tempted to switch to the Logitech personally. But I feel as though I may purchase that down the road and save the Naga for a backup rather than return this beautiful thing. I'm fairly confident that if I switched to the G600 I wouldn't need my backup naga, but this thing is just too pretty to get rid of lol.
