The black is decidedly awesome but sadly the plastic is rather insanely brittle. This post shows some detail of how the plastic deteriorates over time and just how imperfect it generally is. This machine creaks like wicker basket when you move it.
Seeing this, I rememberd that a pretty complete black PowerMac 5500/225 setup has been offered multiple times over the last few months on an Austrian classified ads site. Link can be found in the EU Finds Thread.