With the 9150 we managed to compensate for the mag noise in the code. We compensate less in the Pro firmware

So as far as mag noise goes, the end experience may be a smidge better. We have made marginal improvements in other areas within the Pro firmware and under test conditions (e.g whacking the scaling up high) these do add up to visible improvement. I certainly think the current combination of Pro/Firmware/UI gives me the best experience of all the versions.
Wireless - We're about to kick off the design of prototype II (lots of lessons learned from the first wireless proto). Then we have to jump through some accreditation hoops before we're allowed to sell them. So "2016"

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I've now had all versions of Edtracker and while the 9150 was a marked improvement over the 6050 as far as "experience" goes, it's less so with 9150>pro but pro does really feel snappier, more fluid. I have also tried an LED clip and PS3 camera and that works really well but takes a lot of settng up to guard against spurious refections messing up the LED detection. Compared with the Edtracker Pro tho' the lag is really noticable even at 120fps.
Now I use EDTracker pro for Yaw, Pitch and Roll and My LED clip for XYZ in games like DCS through Opentrack.
Other than a wireless version, I really can't see the pro being bettered, it's that good. Combine it with Opentrack FTW!