The Ace Race putter is a very slow putter with TONS of glide. It almost hovers in the air. But my discs are doggedly understable. They didn't turn very far, and never turned and burned, but they refused to hold a hyzer and never came back once they turned over. I would say these putters don't hold any line you put them on, but they never stray far from straight and they make a nice, soft landing. The main thing I don't like about them is that they're squirrely in the wind, and my Ace Race day was windy.
Definitely set your Ace Race up with lots of SHORT holes around 100-150'. Others at our Ace Race had much more success than I did, and the winner had 3 aces and 2 metal hits. One other guy had 1 ace but 7 metal hits. I never touched anything all day, for two rounds of 42 holes, but I was among the minority in that. Maybe it's just a good disc and I don't have a feel for it yet. I'm reserving judgment until I get more time to throw it on the course, but my best bet is that it will become an approach disc for me. I'm already too happy with my Voodoo and Ridge putters for it to take over my main putting role, but I do like the way it glides and lands softly, so I'm hoping I'll develop a feel for it.