Whoa, those aluminum cam locks are a lot less expensive than the stainless.
Edit: Millstone, I've heard that aluminum doesn't play well w/ hard cleaners, such as PBW, Oxiclean and Starsan. Not sure if this is true or not, but have you had any issues using these cleaners with your aluminum cam locks?
I do use all three chemicals in my setup, I also have an aluminum 15 gal HLT and a 20 gal BK along with those aluminum camlocks. When the brew day finishes I pump either Oxi or PBW through all pots and lines, with camlocks attached, for about 30 minutes. I do not do long soaks, hours, with the chemicals. The camlocks don't show any deterioration or pitting, still has some of its shine, not that dull look like the inside of an aluminum pot. I did change out the rubber washer that came with them to silicone O rings from oringsandmore.com, nice fit and no leaks.
I could well be wrong but I am pretty sure that the dull look of the inside of an aluminum pot is the passivation layer and is actually protecting the pot from reactive agents. on any contact surface you want that dull finish.