ORIGINAL: bkfamily1
I am also curious about OS, but my thought is that they are not as good a value (more $ for the same performance).
I forgot to also add, as far as the OS engines, the VZ-B and older VSpec are the ones to get.
Totally SKIP the OS .21VG engine, it is exactly what you said, cost too much for about the same performance. I have no idea why OS even bothered in making the VG engines, they are a far cry from so many of their other great engines.