I was in the same boat as you, iv'e owned 4 deathadders and bought the Mamba chroma wireless. Its a good mouse, not a great mouse , theres a noticeable difference between wired and wireless, its not night and day but i still noticed it whilst playing fast paced shooters. Its very heavy compared to the deathadder and unlike its previous iterations the battery isn't replaceable.
Battery life is very Average and not what i expected. Switches are superb and the scroll wheel fantastic. As for the dock its a great idea but now and again it will refuse to charge when the pc sleeps which can be a pain.
Would i buy it again ? Probably not, imho the deathadder is the better all round mouse and ergonomically better if your a palm user.
Like the guy above i also have the G900, it took some getting used too but its now my go-to wireless mouse for gaming and day to day tasks, its only let down being the scroll wheel.
A wireless mouse unless you NEED it to be wireless is just a luxury, if you can afford it with ease then no problem, if your trying to justify the expense then there is equally good wired mouse out there.
Check out rocket jump ninja on youtube as he does the best mouse reviews out there.