The pattern guys use them all the time on their 2 meter planes.. I have them on my planes, Excelleron 90 and Venus II, both 120 size pattern planes. The Goldberg Tiger 120 has them, as well as the Seagull Super Star 120.

They work fine. Just use more than they suggest.. if they call for 4 of them on the ailerons, then use 5.

CGr