I'm taking delivery of my A4 (B6) in the next week or two and I am already looking at adding a few thing Built in Sat Nav in particular... I've investigated a few options (Pioneer AVIC's etc), but would probably prefer to get a refurb'd RNS-E, so it links in with the rest of the equipment (MFSW, dash, etc). Are there any major drawbacks to the RNS-E? I've seen some people mentioning extra/updated software... I'm gonna Google around and see what I can find, but if people have links to any extra information on this it would be VERY much appreciated! Such as "what does the newer software give you in the way of features, etc?"