Personally I find most of them overpriced when you can build your own 2TB Linux based music server for about $600 and get iPhone/Android app support..
If you are using the digital outs of your airplay I do think you'd benefit from a Wyred4Sound Remedy reclocker, as would Google Cast.
I rip everything to FLAC, but download some DSD as well, and use USB 2.0 to play to my DAC.
I'm not sure if it works with iTunes, but PS Audio's LAN rover is also a good solution, but again, $600 seems so pricey to me.
If you are using the digital outs of your airplay I do think you'd benefit from a Wyred4Sound Remedy reclocker, as would Google Cast.
I rip everything to FLAC, but download some DSD as well, and use USB 2.0 to play to my DAC.
I'm not sure if it works with iTunes, but PS Audio's LAN rover is also a good solution, but again, $600 seems so pricey to me.