Although opinion about Razer is pretty subjective for every one, I mostly agree on that.
5600dpi i a real bliss, but a find all resolutions above 3200 unusable.
+:
The biggest plus for it that mamba doesn't have problems hat g7 had - update frequency in wireless mode is not close to high end mouses, it's identical, and wifi frequency is auto adjustable, so mamba wouldn't interfere with wlan and other devices (i had that problem with g7)
scroll is gaming mouse scroll (g9's one for example isn't - micro-scroll is 4 office use)
others +'s are ones present 4 all razer mouses (fully rubberized, large buttons etc)
-:
what i find negative on any wireless mouse (including mamba) is that it can't have weight system because of battery placement.
because of that, i find it a bit to light. (i got used to 36g of weights)
also, i feel a bit of a lack of control because of symmetrical hump.
(it could be just a matter of habbit, i only played with mamba at my friends pc)
the biggest - caused by either driver bug, or the wifi interfering isn't totally solved, that mouse pointer blinks when u click buttons (in wifi mod) even when u hold mouse perfectly still!
(i found the problem isn't present only on my friends mamba:
http://www.youtube.com/watch?v=Gsq2uklG_0M )
conclusion - for me, mamba's features aren't good enough reason to replace my stinger which i find more ergonomic, better weight balanced/customizable, bugs free, and has far lower price (i think there's no mouse of that quality/performance/features for that price).
so, although mamba is far the best gaming wireless mouse, for me stinger is still better gaming mouse in generally.
and this comes from a guy who used:
ms intelly 1.1, 3.0, trust mi7500x, ms wireless laser 5k, logitech mx518, g5, g7, trust gm-4600 and now cyber snipa stinger for a year.
other thing that could have effect on any mouse impression is mousepad.
i use coolermaster dualside mousepad.
dont laugh on that, its not peripheral oriented brand, neither it has seducing name, but its polycarbon/alluminum made mousepad, and its miles beyond any steelseries mousepad.