try low-noise.de ... or hardwaredome.de .
They both carry reviews for Cuplex blocks.
From a performance standpoint, they're quite good, just a bit better than a DD maze2.
But where they really shine is construction quality, retention mechanisms, and product range (CPU + NB + GPU + HD blocks, great res, eheim pumps, very good rad - again with great mounting solution - etc..).
For me they're the #1 in Europe, way better than Innovatek.
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