I just came across Ultimate Member recently and installed it on our WordPress Meetup site to handle our community directory. It's a great plugin and I look forward to their continued success.

Obviously I'm pretty partial to the extension model and I think this plugin is a perfect fit. I also think they have the right idea. The core plugin does a lot of great stuff out of the box. Right now I don't need anything more than it currently has but as our community grows I will most definitely and happily purchase add-ons.

Great job to the Ultimate Member team. I'm rooting for you. :)