I like them too, but I don't think they offer the 55A with a nylon tip, which is what kept me searching. I like and have use the Extreme 5A, but it's just a little longer, not thicker. So, I kept looking for the perfect nylon tip stick. I went back to the 5B nylon and tried a pair of Zildjians that I'm still using in the studio, and I use a pair of Vater fusion with the Garage kit. I'm all over the place with sticks now.
But I went to the store and got a pair of Regal tip 5AX nylon, and I think they are just right. They are thicker than any other 5A stick, plus they have the extra length and the coating helps keep the stick from flying out of my hand. I got a pair of Promark 747 nylon at the same time. I did a side by side comparison and the Regals just felt better. So I gave the Promarks to a friend for a birthday present.
With wood tip sticks I have different issues. I love the tip on the Steve Smith sig, but it's a little thin and light for me. Now if they can make a stick with the Steve Smith tip, a .580 dia. thickness, and a length of 16 1/4". I would have the perfect wood tip stick for me. Until they make that one, I'll stick with the Aaron Spears sig model.