It's almost a year old now this article, but I would like to share my opinion after a decent long period of testing plugins and how they work and the compatibility with themes and other plugins.

I've tried almost all of them out. PeepSo is the one I'm sticking with now. It has a solid base as script. Many features, looks fresh and modern. And support is super!

I've tested with many themes now and works with all of them without problems. The same cannot be said about most other plugins.

Okay, PeepSo hasn't have Groups yet, but they are working on it now ... So give it a try with the free plugin and you can add extra functions by getting the premium addons as well :)

Hope this helps some people in their decision :)