Sonos Connect Wyred4Sound Mod Any Good?

Schiits response to my email said to not send an up sample to yggy,. It is better to let it do take care of it.  The only other improvement from the upgrade would the better clock low jitter.  The yggy already says it has s good stream so I don't see how an upgrade to the stock Sonos would be any improvement.   Am I missing something?

Jitter is a big deal. You want to feed your DAC the lowest jitter source possible. 

The power supply upgrade on the Ultimo can't hurt either.

jitter is a major weakness of the Sonos

Yes, that's why the clock is upgraded by Magna audio.

There's quite a bit of noise coming through the ethernet in my setup. 

I hope the Waversa hub will address this.

Ethernet?  Let's not get confused here. 
Not trying to be condescending but you can remove that worry as long as you don't get total sound drop outs. Believe me