I noted a huge difference in flight performance on my Partner (which I had flown for five years prior, so I knew a thing or two about how the airplane flew).

Anhedral stabs give the effect that Archie noted, but there are some negative side effects- chiefily positive and negative snaps are very inconsistent from one another and the airplanes that I've flown with them didn't particularly seem to lock in. Personally, I haven't seen enough benefit to outweigh the negatives of having anhedral stabs, and I have seen a huge advantage to the use of a canalizer.

Your mileage may vary.