My local proshop just got these in. I was looking at them yesterday.

The pins are actually stationary. Each pin is attatched to an independent ring. The rings are then mounted to the slide. So when you adjust them, the entire ring actually adjusts up and down so the pin always stays at the same angle. This is true of both the triangle and the pentagon sights. I am pretty sure this will be my next sight if I don't go with a single pin adjustable.

I currently have a Vital Gear Tombstone series sight and it is awesome.