castpuzzle.net My brother just brought me one from Munchen and I went crazy about it :P
This is mine: Cast Radix.
I found it to be a little more difficult than I thought at first (it's level 4) but I managed to take it apart and then assemble it again two times after some hours - still playing with the movement though.
It's precise, solid, you can feel the weight of the pieces and if you played with low-quality puzzles before you know what I mean.
I really like the design also!
I'm thinking of buying more of the serie on ebay...
Do you like puzzles?