While neither the Citroen SM or VW Phaeton moved the game on tech wise, they were both designed to push their manufacturer into a different market, and weren’t particularly successful at doing so. Both ‘glorious failures’ in my book, but the Phaeton did begat the Bentley Continental GT, so we’ve that to be grateful for!
IMHO the VW is a very handsome car, like the original Audi A8, and if in need of anything that big, would be a good used purchase....