Slug looks impressive!
The project I'm most known for is basically an MSDF shader with a bloom pass. It serves my needs 100%, though if I expand to support arbitrary text, I may reach for Slug.
The one issue with MSDF I want to raise is, it seems everybody uses the same msdfgen texture creation program from Viktor Chlumský's master's thesis 11 years ago. I wish there were other implementations. Who ever heard of a graphics technique that was only ever programmed once, and then used everywhere without substantial iteration? We need to de-XKCD-2347 MSDFs for everyone's sake, including and especially Chlumský.