i kno loads of people who have bought stuff from germany with no problems, 1 mate even bought 5 wheels from some guy in germany and all was fine.
i think its only as big a risk as buying anythin else on ebay, the main problem comes with communicating if things go pete tong.
you say full stainless for £85... is that a full system, or just a back box, cause volksbits are doing stainless back boxes for £99, but then i dont kno wat (if anything) the delivery is.