I have an M2 site running Manadev's Layered Navigation extension and Mirasvit's Sphinx Search Ultimate (recently upgraded from M1 where these both were running together). Long story short - they don't seem to be playing nice together anymore.
The Layered Navigation is the more important one driving a lot of our SEO, so we are really hesitant to switch that. Manadev does have a search extension, but it seems to be lacking in functionality we need.
1) Anyone have experience changing a layered nav extension and what impact it had on SEO
2) Suggestions for a search extension to use if we stick with Manadev's Layered Nav?