I'm still using an older version of Sphinx. I love it. It's fast, moderately flexible, very lightweight, easy to set up and produces good enough results. I have

I'm still using an older version of Sphinx. I love it. It's fast, moderately flexible, very lightweight, easy to set up and produces good enough results. I have also found it to be highly reliable (at least the version I've been using for years). It's not useful for anything that needs hyper scale (Twitter et al), however for the next tier of scale below that it generally does well if you know how to leverage its strengths.