poor design...
IMO, just about all single bolt posts that rely on serrations for angle adjustment are lame. I'd never buy one again. I use only 2-bolt models like the ITM/Selcof, FSA K-force or Thomson. Any of these can be dialed in perfectly.
Another poor design is the single bolt type that uses a single side clamp bolt. There's no limit to the angle adjustment, but also no way to make fine adjustments. If the clamp bolt is loosened for a simple fore/aft adjustement, the saddle if free to tilt up or down. Really bad for any on the road changes.