In reply to mike kann: sorry, this arises from my sloppy definition of holding power. to clarify:
the cam angle is the angle between the contact point of the cam lobe and a line going through the cam axle that is pependicular to a parallel sided crack (this corresponds with the angle of the tangent to the surface). hence increasing the cam angle places the axle of the cam further behind the contact point of the cam lobe. this decreases the component of the load perpendicular to the walls of the crack and means that the cams have to rotate through a greater angle for the placement to pull all other things being equal. hence an alien will stick in cracks that are more flared (by 2x2.25 degrees). as you say, range increases with cam angle - this is a good thing for small placements as small cams have a very small range and so smaller wrinkles on the inside of a placement can have drastic effects on its quality.
I think your point about the softer alloy is very valid - it can be very disconcerting watching a cam skate around on small crystals and edges inside a placement - aliens seem to bite into these when tugged and so inspire a bit more confidence!
I think that the old BD camalots used softer alloy than friends, but this may have changed on the new version.
the new c3's look very nice.