Sonos Connect Wyred4Sound Mod Any Good?

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

I have the yggy DAC from Schiit.  They are not confirming or denying that sending the yggy a better PCM steam with less jitter makes any RATIONAL sense.  If the stream is not good enough the light for "Need Better Stream" comes on.  The stock Sonos stream is good enough and does not cause the light to come on. Only really bad equipment would cause this.  

Anyone have the Sonos and YGGY that had done the mod post getting the YGGY out there care to comment. 

This Schiit already sounds so good matched up with my Prima Luna HP. 

I use a Wyred4Sound the Remedy in between my Sonos Connect and my W4S DAC2 and it definitely makes a big difference.