I managed to get hold of a few early release AxiCubes a couple months back which I have now extensively tested and used.
It is great and I love the fact that it can be used at an angle due to the 3 axis measurement. A regular angle cube has to be rotated to align with the sharpening angle (always perpendicular with the sharpening alignment). If a regular cube is used at a rotated angle (not perpendicular), then its reading is incorrect. AxiCube does not suffer from this problem.
One very important thing to note, is that you have to keep your K03 sharpener on the same table and in the same spot as where you have calibrated your AxiCube. When you move to another spot (not the exact same angle as the surface you calibrated on), then you have to re-calibrate your AxiCube again. Most tables or work surfaces are not 100% level, so invariably there are differences in the angles of work surfaces when you move your K03 around.
Regarding AxiCube use on Other systems - It can be used with some other systems, BUT only if the knife clamp or magnetic table is designed to be angled level with the horizon/ground. The AxiCube system has an internal "level" reference that CAN NOT be zeroed or recalibrated at all (you can zero the reference with a regular digital angle cube but not with the AxiCube). To calibrate an AxiCube, you need to set a 14 degree sharpening angle on your sharpener, then go into the AxiCube calibration mode. When calibrated, it re-references a 14 degree angle on the display only, it does not actually re-reference its internal zero angle at all. The problem clearly shows if you try using the AxiCube with a system where the knife clamp or magnetic holder is angled upwards. When using it with (for example) an Edge Pro Apex system, everything seems fine and it "calibrates" nicely but when you then try to adjust the sharpening angle you immediately see that it does not work properly on a system like this.
For Example : Let's say your sharpening system has a knife clamp or magnetic mount designed to angle the knife upwards at 20 degrees. You want to use your AxiCube on it, so you set 14 degrees sharpening angle on your system to calibrate your AxiCube. You finish your AxiCube calibration, and it now shows 14 degrees on the screen. Everything seems fine until you adjust your angle upwards then you see that your AxiCube is actually counting DOWN on the screen as you adjust your angle UP-wards. It counts down from 14 degrees all the way to 8 degrees and then reverses and starts to count UP again as you move past a level angle with the ground. When your actual sharpening angle is set to 20 degrees (which is level with the ground on your specific sharpener), your AxiCube will show 8 degrees on the screen. Keep going up to a 25 degree sharpening angle, and your AxiCube will now indicate 13 degrees.
The fact that the AxiCube cannot re-reference its internal zero angle, makes it basically unusable on any system that does hold a knife level with the horizon.
AxiCube can be used on these (and other) systems:
TSProf K03
Edge Pro (Professional model only) when the blade table is angled to be level.
All Kazak sharpening systems (When the blade table / clamp system is angled level)
Many KakBritva sharpening systems (The ones with the option to angle the blade table level)