Does the Cambium darken with use? Seems like it would, which is why I believe saddles historically have been sold in a black finish. I wonder if the canvas cover material isn't rougher than leather and more likely to abrade bicycle shorts.

I have a B17 with ~800 miles. When new it was slippery and hard as a board, and twice as heavy as any modern-design saddle. After waterproofing treatment it began to sag, despite tying the skirts, and I found the saggy, hammock-like feel uncomfortable, so I quit using it. I would consider a Cambium if it doesn't suffer from the same tendency to sag with use as all tensioned leather saddles.

Brooks' advertising states "the new construction of Cambium Saddles works like a hammock and delivers immediate comfort while absorbing vibration and shock, performance traditionally found only with natural leather saddles". I know I'm not alone in wanting a fairly firm saddle that doesn't sag and hammock like a traditional Brooks saddle. I think it odd that Brooks actually describes the Cambrium as having this same potential flaw, but portrays it as a main design feature.