Who is using I2S cables?


I've been reading / watching info and trying to learn about I2S. Several manufacturers offer I2S connections (Topping, Pro-Ject, Jay's, Denafrips, Singxer, Raspberry Pi?...). I2S has been used internally for years (mainly internal CD to DAC connections) but some components have I2S connections. So, I'm confused and curious. 

1. Are you using I2S cables? What has been your experience? 
2. What components are you using I2S to connect?
3. Are you using an HDMI cable or so-called bonafide I2S?
4. Where did you purchase your I2S cable(s)?

Thanks!
128x128dreas
I noticed a significant difference in my system switching from using an AES connection (DH Labs D110) to an I2s connection, initially using a basic $12 HDMI cable from Amazon. Switching from this cable to the Tubulus Argentus cable was an improvement, but more subtle. If I was on a tighter budget, I might have returned it, but I do like the sound. I have not tried other higher end HDMI cables. 

I currently have my Roon Server connected to the Gaia DDC using AQ Diamond USB. Inserting the Gaia instead of connecting the Roon Server directly to the DAC was a worthwhile improvement. I have not tried connecting the Gaia to the DAC with USB also. 
I prefer l2s over USB including anything else my Holo Audio dacs l2s inputs pin outs are configurable to match just about any popular brand. Currently I’m using a generic brand of HDMI cable it’s surprisingly good .

Late to the party here. I have the I squared 2 connections on my DAC and transport. I don't do hi-res at this point, only redbook CD and use a very high quality Voodoo coax cable. Woud an HDMI cable make any difference in this case? Thanks!