Keep in mind that Sonos is not a High End audio product.. but sonically they can be made to sound excellent.. and probably as good or better than your brother in law needs..
Also and I can't stress this enough for most non audiophile folks it's really all about the interface, stability and ease of use.. The other options out there like Control 4 are way more expensive and cumbersome to use.
Most normal folks will be thrilled with a Connect Amp driving a good set of bookshelf speakers, and a Connect going digital out into a decent AV receiver will sound as good as anything else going in digital. If one is going to run a Connect into a better (higher end) system then using a re-clocker from Empirical Audio or the like is almost mandatory.. but it all depends on the end user.
Also and I can't stress this enough for most non audiophile folks it's really all about the interface, stability and ease of use.. The other options out there like Control 4 are way more expensive and cumbersome to use.
Most normal folks will be thrilled with a Connect Amp driving a good set of bookshelf speakers, and a Connect going digital out into a decent AV receiver will sound as good as anything else going in digital. If one is going to run a Connect into a better (higher end) system then using a re-clocker from Empirical Audio or the like is almost mandatory.. but it all depends on the end user.