"There is no reason to give up your favorite manifold, just improve it. Looking for an almost bullet proof product designed for for a technician by a technician, look no further."
"Almost Bullet Proof"
Jim has written this about Digi-Cool and don't think I've ever seen anything written like this about a 550 especially not a 523.
I bought some products that were "cheaper" just because they were cheaper.
Nobody ever told me they were tougher than a more expensive Digi-Cool I just made the wrong decision all by myself.