I currently use the self-hosted version on Heroku and impressed with its functionality. It's quite similar to Heap Analytics. My favorite feature is auto-tracking. That said, there are some scaling limitations currently if you have a high traffic site. We have a couple hundred thousand users monthly so we are likely on the larger side of PostHog deployments. The team is cranking out features and improvements incredibly fast and I'd expect these to be resolved soon. Feel free to DM - happy to answer any more questions.