I used tri stock on my .46 Do with some positive results, I placed them slightly above the center of leading edge on the wings to make a "sharp" separation point to bring on full stall at lower angles of attack. The constant radius leading edge has a very wide area(angle of attack) before separation occurs, I believe thats why Do's rock so much until its almost standing up. Full scale aircraft use stall strips to test stall characteristics. Power on -level flight wasnt affected much, only increased landing speed was noticed and it did harrier a little better,still not very good in gusty winds though, still rocked on those days.