Those demos are actually pretty killer. As much as I like Lindsey Buckingham and think he's a master song craftsman, he did tend to get a little too obsessive and heavy-handed with production in the '80s. I loved both the Mirage album and Tango in the Night but both sound so dated now production wise.
I too will second to those who have stated that Lindsey Buckingham's solo album in the '90s, Out of the Cradle, is his masterpiece. One of the best sounding albums I own.
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