I have both a G2 and a Stadium lll and each has attributes that are unique to each. The G2 is fast enough to keep up with the 6 servo controlled woofers in my Genesis G500 speakers but I had trouble blending it with other speakers. The Stadium lll on the other hand has extension that provides a different acoustic signature and its speed blends better with most speakers. Think of the G series as a Porsche and the ST series as a Cadillac. The Stadium lll provides solidity and air and the G2 adds speed and definition.
Hope that helps
Hope that helps