I'm looking at a Sony XAV-AX100 Smartphone receiver to replace the stock Command setup in my 2000 S500. It's really slick as it integrates with an iPhone allowing control of everything using Siri. Has anyone installed an aftermarket radio in this model and can offer advice regarding the challenges I might face.

Thanks.

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire