I just finished putting a Venus II together for a buddy, and we put up four flights with it yesterday. This one has a .120 AX up front, and it REALLY pulls! Compared to my Venus II, which is powered by an OS .120 four stroke, it offers quite a bit more performance. There is a gigantic increase in the vertical, as well as greater overall authority in all maneuvers. The trade-off is a dramatic increase in fuel consumption. Here is a picture of the airplane with it's happy owner.

The 120 AX was a typical O.S. quality experience, starting with the first bump of the starter, and never missing a beat. I can see why it is such a popular set-up with this airplane.