Thanks Lewis,
Though I can't believe they've not fixed the "disappearing groups", "incorrect environment from SU shadow settings" and "VRay materials getting 'stuck' to SU geometry even though the material's been changed in SU" bugs. They're pretty damn serious- the disappearing groups and shadows ones are bad enough to put demo users off. Sure they all have workarounds, but they should have been picked up early in the beta stage IMO.
Oh well, it's still one of the best and definitely the fastest renderer out there and a very stable prog (Vue d'Esprit users will know how novel the latter concept is!).