It was replaced from my local store with out a problem just had to wait for them to get the stock in. Personally i love the mouse it self its so much better than the ones perviously i have had with tracking it just feels so much smoother across my screen. Also the lift off distance seems to be way better with this as well, i went back to my rat 9, g9, and well i remember what the naga was like while i was wating for a replacement. Their lift off distance was so terrible also the reaction you get on screen when you do it makes it hard to focus on what i was doing in fast paced fps games.
My grip with this mouse is basically a cross between palm grip and claw. The middle of my hand is off the mouse at rest sorta like a claw although it does touch when i am frantically moving around but does not apply much pressure mostly because of the size of the DA 2013. My hand in general is more relaxed like a palm shape the claw shape is very cramped and i dont like it for long periods and feels like i have less control.
With other mice i have had like the g9 and rat 9 my grip is very simular but my palm dosnt touch because of the shorter length of the mouse instead its only my finger tips and the inside knuckles touch the mouse. With both grips my ring finger and pinky have as much contact as possible, my thumb is still in a claw style using the tip and joint to press thumb buttons. I have a medium size hand, as i use medium footjoy stasoft golf glove.
Hope this helps