I'm guessing those ProMark sticks are getting blown out because D'Addario has revamped and redesigned the whole ProMark line.
I got two new pairs to beta test ("Project 151"). They're really nice sticks.
I used to play their 5As and 747Bs all the time.
Basically, they're going to be offering sticks in several diameters and two taper options (forward and rebound). I really like the the feel of the rebounds (a bit more power without being too bulky at the butt end), and I am hoping they introduce these in selectable lengths too.