My Epsilon is being delivered now, so I haven't flown one yet. But, I do have a Widebody 40 that is also by CA Models, and a friend has the 60 sized kit. Both are perfectly axial when rolling. My WB is my first pattern kit, so there are a lot of mistakes that I probably made with setting it up. Still, it is an incredibly solid plane.

I'm mentioning the Widebody because CA Models says that the Epsilon is a refined version of the Widebody for sharper snaps, smoother knife edges, and an improved airfoil for the wing. Mine has straight verticals and downlines. The rudder is incredibly effective for perfect stall turns, even on very low rates. I have no worries how the Epsilon will perform after seeing how the WB flies.