I've had the BOTL Acutex LPM lying around here for years, the 206 II, complete with the Saturn V integrated headshell. The stylus, a .7 mil conical, was busted when I got the cartridge so I've never heard the thing.
Mine is, as mentioned the bottom of the heap from the "Standard Series", the lesser of the three ranges. The OP's is the 312 III STR, the better of the two cartridges from the middle range, consisting of the "Almost Perfect" and the "Best Elliptical".
This thread has revived my interest in this cartridge. Since all three bodies in the Standard Series are the same, I can upgrade my 206 II by using the 210 II E stylus. It's a .3 x .7 mil (nude??) with a titanium cantilever (according to TTN). It's the same stylus and cantilever found in the "Best Elliptical" 310 III E.
I think the principle difference in the bodies from the Standard Series and those above is that the upper levels have area three pole induced magnet design and the lower level, like mine, is also IM but a two pole type.
So, this long-winded post is really a request for opinions on the Standard Series. Do these approach the performance of the "300" series cartridges like the OP's? I'm probably going to order a stylus just to satisfy my curiosity but I'd still be grateful for opinions.
TIA,
John