I have not compared it to the Chord in the same system. However, I have heard a demo of the chord being added and the effect was very similar to the impact of the Quartz Audio in system. Still need to demo the Chord in my system, just not got round to it yet.
I am using a combination of Chord Company Sarum from router to Melco sever to first SoTm switch, then fibre between switches. The final SoTM switch has Chord Company Music to streamer.
Personally I found moving from supports that dissipate in the floor to isolation, made a big improvement and I have never looked back. All spikes are now gone, all components and speakers float rather than being fixed. Spatial information and naturalness took a big jump up.
Alongside...
I can advise that I have tried a lot of SPF's and the winner is the Cisco SFP-10G-AOC5M (this is the 5m version). You can pick them up on eBay cheaply used and they sound best. Lush sounding, not sibilance, great sound stage, bass and a really natural sound.
They are listed here also...
No, but from what I remember they look a bit like this: https://www.vehicleclips.co.uk/products/small-5mm-push-fit-plastic-rivet-for-bumpers-grilles-trim-toyota-90467-05170 But much smaller, as these are for cars. ;-)
My experience is the same here.
I would say that the finisar has a slightly warmer sound than the Cisco. But the Cisco does not lack bass at all and as noted has a higher grade of realism in the sound.
Like you no going back.
I have recently moved from FCBG110SD1C03 to the Cisco SFP-10G-AOC5M SFP+ and see a big jump in performance. Running them between two SOtM switches.
The Cisco reveals more detail, the sound stage is deeper, the objects, either voices or instruments sound more 3D on the sound stage, better bass...