ORIGINAL: Ryan Smith
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.
I've also found a good change from a canalizer. That said, I've not been able to go from a flat tail to an anhedral tail to compare and contrast.
If you're unsure as to whether it's going to work, fit a temporary canalizer mount on, and fly.
I did that 2 years ago. I haven't bothered to fix it permanently, but if it falls off, it'll be a permanent fixture from now on.