A good friend at our field built one and powered it with an OS120AX with pump and stock muffler. He is not a pattern flyer but my son is and John asked Michael to give it a fly. John is not into computer radios and still uses y hanesses an everything. Plane flew extremly well! No mixes! Lucky maybe ,but my son (not easily impressd) was amazed! John, builder of the Leo, loves to see a slow roll and every time Michael flys he has to do one for him. 1000 ft slow roll, Beauliful! Knife edge was good both ways. Again, lucky maybe, but from what we saw it is a great airplane especially for the price. Be aware it has a one piece wing and a pipe might be a little bit tricky.
Two thumbs up from myself and Michael!

Good luck!
Rick