yes, I've wandered around that german site before, the maze2 gets destroyed compared to some of those other blocks.
http://www.low-noise.de/web/artikel/...ests/inno_rev3
that thing wins overall, which looks like the one from the THG review. It looks like it has a ribbed inside, can't see anything else on it though.
http://www.low-noise.de/web/artikel/...tests/cuso_k41
that one comes second, there is a lot of surface area in that one for sure.