SteelSeries just released their newest high-performance offering dubbed Sensei. Sensei features a 5700 DPI capable sensor and has an onboard 32-bit ARM processor which handles transmission to and from the PC and can run an interpolation algorithm which boosts the output of the mouse to 11400 DPI or twice that of its native resolution. The visual appearance has changed a bit since the Xai mouse, but you can clearly see that all the main parts have been left relatively unchanged. SteelSeries' explanation for going with the incorporated ARM processor, besides the interpolation features, is that it allows them to shape the output before it is passed to the PC. This should give a small reduction in delay in the millisecond range. The mouse sells at $89 which is the same price the Xai was introduced at.