Now that I've been flying this tri I note the only issue with the fins in that they offer little left/right resistance. So if the tri leans on the ground the tail motor offsets, which causes the tri to swing again on the ground. Translates into a left/right oscillation which smooths out when it is about to lift off - but a little annoying. Might supplement the fin with something to make it more rigid.
But excellent for visibility and orientation in flight!