The bellcrank mechanism inside the caliper case is simpler in the Weinman Deltas compared to even the 1st gen Deltas from Campy. The finish on the aluminum parts isn't as nice either. It also does not help that it has teeny tiny brake pads.
The faceplate on the Weinmann Deltas are plastic, maybe Delrin.
The calipers collect road grit but not as bad as the Campys becase the bottom of the case is open so most of it falls back out.
Still an interesting brakeset though and not that common.
I have them on my ALAN Record Carbonio. Brake about as good as the 3rd gen Campy Deltas I have on my Montello.
Weinmann was also able to integrate their "automatic" caliper quick release in their Deltas, so wheel changes are easy to do.

The Weinmann Delta "Pro" brakset, just adds a black rubber cover over the calipers to seal them better from water and grit, otherwise they are identical to the ones on my bike.