Just took a further look locally here on these forums. Weirdly enough, searching for “Kanji in Context” here on the forums yields not too many results or ones where people just say the phrase “kanji in context”.
This is really the only impression I’ve found, and that was rather basic…
For what it’s worth, I found that kumasensei wrote that it was the primary factor from going from N2 to N1, so that’s quite good testimonial.
I hope you’ll find others that can share their wholehearted experience. For what it’s worth, it might be worthwhile to broaden your search if searching for KiC content is too specific. I recall that, Kodansha’s Kanji Learner Course also has a sentence reader as auxiliary material for their kanji textbook. It might be a good strategy to see how SRS with sentences could be helpful for you.