At Overclockers in the UK, EVERY Zowie is £50. What makes them each different? )
i'm pretty sure that
only the shapes are different.
the ZA11, ZA12, ZA13, EC1-A, EC2-A, FK1 and FK2 all use the same 3310 sensor, the same matte coating and the same switches.
it's a shame about the high price - but i suppose 95% of gaming mice are highly overpriced :-)
i'm pretty sure the alcor is a good mouse. it's up to you to imagine if the high LOD might be an issue.
sensor-wise, the biggest difference is that the 3090 (of the alcor) only has the 800 and 4000 steps that are native to the hardware, while the 3310 has all steps native.
but, considering the price-difference, it's hard for me to recommend you a zowie mouse over the alcor.
and most people definitely prefer the (omron) switches of the alcor over the (huano) switches of the zowie-mice.
i most certainly would not recommend any zowie mouse other than the ones i mentioned above, they're all too unreliable.