I have bought the S+RJ10 and pluggin in a ccr2004-16g-2s+pc router.
The card is recognized, but when I connect the ethernet cable of the ISP's router, it shows no link, no leds light up.
Also, I've tried to set the speed to 1Gbps or even 100Mbps, with no change.
The ISPs router is in bridge mode and uses pppoe for connection.
I bought it as they will never provide support via Fiber link as you will always have to use their ONT but they already started to install the 10Gbps lines. And this product was listed as compatible on microtik's website.