At the moment I’m using the Stream 1 as a NAS storage for music files, while I’m still using the NDX2 as the streamer.
I also tested the Sense App and found the interface wonderful; however, the sound quality is lower compared to streaming through the NDX2.
I know that, to achieve the best sound quality, I should connect the Stream 1 via the S/PDIF output, but I haven’t purchased the module yet, maybe in the future.
If you want to use S/PDIF output then your NDX2 will not be used as a streamer, as I understand it.
Yes, correct!
I don’t think the Streamer part in the Innuos is better than the one I have in my Naim NSC 222.
Innuos themselves claim Stream 1 is below Pulse in performance. You need their LPS to perform better.
I use custom designed isolators built for hi-fi use by Eric Giese, but they aren’t commercially available.
They are specifically designed to isolate low frequency 50/60Hz noise and limit common mode noise (CMRR - Common Mode Rejection Ratio) while maintaining DCMR (Differential to Common Mode Rejection Ratio)
I also have isolators from DX Engineering, their ISO-PLUS and think they are excellent. Slightly different philosophy in terms of design to the above, but also very effective and I’d recommend them.
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I found out this thread, searching if there is somebody else who thinks that, depending on the implementation, a floating shield could sound better than unwillingly making a ground loop with an ethernet cable
I have fiber-LHY FMC-Neotech neet1008-Gustard X30
I find out that adding a Ifi Isilencer before the dac, just to break the shield connection, sounds more coherent and the high frequencies are much clearer
Wiling to bet there’s a fair mark up comparing retail price to the parts cost (maybe £15)? The transformers are readily available. Unless there’s some wizardry on the other side of the PCB 
Note, I am making no comment on effectiveness as I haven’t tried these. Extra isolation can do no harm I guess, despite IEEE 802.3
T’internet has loads of DIY instructions/modules using transformers like these.