"Choosing a mouse is a personal affair.
What glides effortlessly along like greased lightning in one's hand might plod along clumsily like a mule in another's. What opens new realms of performance for one gamer might open new windows of grief for another.
This perceived 'inconsistency' is a source of great puzzlement and chagrin to many gamers today, who often attribute a mouse's less-than-satisfactory performance to manufacturing defects, inherent design flaws, or worse—technological impotence.
And because our hands and playstyles vary in a great many ways, word of mouth and mimicry can only go so far." - Razer Mouse Guide.
Each Razer mouse are designed for a particular mouse usage style. They have researched it and even came up with a guide on how to select a mouse.
http/www2.razerzone.com/MouseGuide/index.html
What is perfect for you might not be for me. I own and have tried all of Razer and Steelseries offerings, and the one that is suited for me is the Razer Lachesis. Mamba and Death Adder comes close but just fall short of perfect comfort.
So, the Mamba is not comfortable for you, but you can't just dismiss it as uncomfortable for all and then brand the Ikari as a 'clear winner'. It's a winner only for you.