We purchased a couple of AXI 2826/13 F2B from Esprit Models a couple of years ago. The motor's price point and its pedigree set expectations for a higher than average performance potential. In retrospect, I'd say that they did not quite live up to these high expectations.
I started out with a bench test, by running multiple motors under the same load that emulates actual in-flight load (APC 10x6E at 10,400 RPM) and then comparing battery charge consumption and motor temperature. The AXI was almost identical to Scorpion SII 3026-710, a little better than Cobra 2826-12 and E-Flite Power 32, but not as good as Plettenberg Orbit 20-16. So far so good, although I noticed that the AXI was hotter after the run than most other motors. I later correlated that to some of the highest winding resistance in the industry, which I can measure with sub-mOhm precision using tools at work. This observation proved accurate in the field, as the motors were landing pretty toasty even in our mild Midwest summers. On the positive side, I think AXI has some of the strongest magnets out there.
After a few dozen flights, I noticed that the shaft was no longer firmly held in the rotor by the two small set screws. In order to get to the set screws, you have to remove the rotor and then an internal cooling fan, which is a flimsy plastic 3D-printed part glued in place. It was impossible to remove the cooling fan without breaking it. However, after looking at how the cooling system was designed in this motor, it was apparent that neither the fan nor the rotor body were doing anything to promote cooling, so I chose not to re-install the fan after the motor was re-assembled. One of the two motors is still in service (another one was totaled at the Nats), but it is no longer on my list of equipment I'd buy again. There are very decent motors out there at roughly half the price of AXI and almost identical performance.