I have to defend my poor little block, by giving this link....
link
what is often not realized, is that my design will thrive on even the slowest of flow-rates, because the liquid to copper interface are so large and the ratio between surface area vs. block volume are very large as well. where as a more open, easy flow design, will get to a point, that if the flow is any slower, it just can't scrub the hot lair of water touching the side-walls, and therefor those designs go for a nosedive at low flow levels.