I'm thinking about buying a Faber-Castell Ambition (black), but I'm a bit skeptical. Please help if you own one. There seem to be some unclear issues: 1. Does the resin body crack when screwed too tight? This seems to only be a problem with the black version, as the others have metal threads. 2. Does the the cap stop clicking in place? I read a review that said after 2 months the cap wouldn't click to the body 3. Is the grip section uncomfortable? It looks like it is. Also, how would it compare to a TWSBI 580/ Classic? Help is much appreciated. Thanks in advance!