It has different firmware. Also uses 1000 hz polling rate.
Concerning sensor tracking delay I am unsure if there really is any way to really measure it.
If you guys can link me a tut or tell me I can do that.
From subjective feeling I would say there is no smoothing or delay, I barely can notice it on the Finalmouse 2015 either. So don't take this as a fact.
Regarding build quality:
It overall is really ok. They applied a matte rubber finish all over the mouse, which is as I already mentioned comparable to mionix mice finish. As some ppl dont like it I wont guarantee you that you will enjoy it, I personally do.
The overall quality is good, although there are minor flaws -> mouse wheel too hard to press, little design fails, all mentioned in the OP.
Unfortunately I cannot make a 1:1 comparison to a sensei, cause I do not own one myself. Just tested the sensei and returned it due to its poor sensor.
In deed there are differnt informations about that step. lol. I will measure it when I am at home. Curious why you would even care about such a high cpi step.
Availability: i originally ordered via their Homepage. The Form did not work due to some problems with my mail address. After all the purchase was finished directly with their support. Support guy was really cooperative and fast.
Edited by unplayed namer - 2/15/16 at 3:28am