It was my search engine for like two years. They really did do a lot of good stuff:

• no ads
• focus on community generated (reddit, forums) content over seo spam
• special widgets for things like recipes/sports scores and even stack overflow
• search your own content from e.g gmail (though I never trusted them enough to use this)
• ability to rank sites
• one of the first to implement AI results, with sources from the beginning

Now I’m looking at kagi.com. They’ve basically been doing what neeva did, but better, and with more features. Plus they’re bootstrapped and sustainable instead of running on a VC money high like neeva was.