I have the Razer Naga Pro wireless with switchable plates (the first version that's not available anymore). I've had it for a year or two and I'm already getting the jumps when scrolling with the wheel. I tested various settings, different computers etc. and yes, it's the sensors.
Now, does the new version of this Naga with Razer HyperScroll Pro Wheel have optical sensors for the wheel? I can't find any specs that would say if it's mechanical or optical. I don't want to buy a 180$ mouse if there's mechanical sensors in there, because they would get dusty and tired again in a year.