unimpressive performance, terribly restrictive, aluminium.
only plus side is, theyre dead cheap compared to american stuff. but i prefer eddy's ekwaterblocks stuff to dangerden anyway. too bad he hasnt finished the 7950 block we were planning over @ xtremesystems yet.
really, the only worthwile german blocks are the NexXxoS XP series for the CPU, and the Watercool GPU-X series on the GPU... and those are very, very good. bizarre that other blocks by the same companies arent worth bothering with, but *shrug*