I like the looks of the OCWC silver polyblocks. The poly part of the block doesn't make it any worse than a solid metal one, in fact I believe that it might actually improve the performance of it becase, as the poly does not conduct heat/cold very well, the water flowing through it doesn't radiate its coldness off. The DD blocks are good, a friend of mine is using one and it works great, but I'm planning on using the OCWC silvers in my next project.
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