As for the general 'lag' issue that's spread about from poster to poster here, I found a summary
of what the possible cause may be courtesy of a user on another forum. Seems to be related to interpolation, if this info is correct.
Zowie mice suffer from a bit of an issue regarding the sensor and it's use of non-native DPI steps. For the Avago 3090 sensor, native DPI steps as previously mentioned are 400 / 800 / 1600 / 3200 (although Avago has done some SROM updates, it might be 800 / 1600 / 3200 / 4000 now, but that's a little irrelevant). To achieve non-native DPI steps (450 / 1150 / 2300), the mouse sensor has to be interpolated, meaning additional calculations must be made to achieve these DPIs. With these extra processes, there is the addition of a minute amount of latency (while I can't pull an exact measurement off the top of my head, just imagine playing with 1-2 extra ping, in the same vein of monitor response time). Note that this is quite minimal, and the majority of owners on threads discussing this state that even with such an effect present, no difference can be noticed in control of general movement. I believe the 2300 DPI step is the best at reducing this latency, but unfortunately the higher DPI comes with notable jitter, as with most mice, so most users stick with the lower steps.
So! Overall, Zowie make extremely solid mice. The sensor issue is quite minimal, the only reason to avoid would be if you are extremely picky about sensor performance, but even then I'd say go ahead and try one of their mice for yourselves anyways, again this latency is hardly/not noticeable for the large majority (and you're still getting a flawless sensor). Hopefully this explanation helps, apologies for the wall of text.
I wish OCN had more of a culture of the OP of OT threads like this one keeping the first post updated. So many major threads on OCN lack basic, solid info on the products they are about