I've been rather pleased with my distribution block. I have mine hooked in parallel to a capacitor and then I'm running two amps off of it (a sub-mono amp and another for car speakers). It's worked great so far and is easy to work with. I think that ~20 dollars is a little steep, but the quality is great. You can feel how heavy it is in your hand. The plastic cover is the only thing I worry about breaking off someday just from someone hitting it accidentally, etc. Overall, I recommend it.
I was very surprised of the excellent customer support, selection of products, and competitive pricing. Sonic Electronix beat all of the competitors prices. Not only that, it is great that you offer free installation accessories. I will definitely be a repeat buyer from you guys!