Of course, it is minimizing crosstalk at only one test frequency (1 kz on the Analogue Productions test lp), unless one finds other test lps with single channel signals at other frequencies.
Two reasons in one sentence why some of us will probably never buy it.
First, 1kHz is well below the optimal frequencies for setting azimuth.
Second, as Mike Lavigne and others have repeatedly explained, minimizing crosstalk provides only an approximation. One must still tweak from there to minimize inter-channel phase discrepancies. He, Dan and I do this by ear. So can anyone, with practice. The Foz doesn't do it at all.
For $250 the Foz quickly and reliably gets one in the ballpark. However, as Larryi also discovered, making the stylus visibly vertical also gets one in the ballpark, so close that "adjustment from visual, perpendicular alignment was extremely small (I cannot reliably see the difference)." How much more in the ballpark need one get than that? Why spend serious money to just to get in the ballpark? I can get there for free in seconds using the loupe and Mint protractor I already own.
As Dan suggests, azimuth is easily and accurately adjusted in two simple steps:
1) make the the stylus vertical by eye;
2) fine tune in TINY increments by ear.
The Talea makes executing step 2 much faster, but it can be done by ear on any arm with adjustable azimuth.