I have been using BuddyApp for several years as my go-to for Community Building. It's not only one of the most beautiful implementations of the BuddyPress toolkit I've ever seen, but one of the easiest and most feature-rich.
SeventhQueen's support is top-of-the-game. Their ticketing system and extensive knowledgebase make it easy to drill-down to precisely what you need. Their team is quick to respond, friendly and goes the extra mile to ensure BuddyApp fits your unique use cases.
Their code is tight, well-documented and easy to extend and comes packed with beautiful sample content to help you get up and running fast. It's the most frictionless platform I've ever used, coming with a set of plugins that already play nicely together, extending the functionality to include a full suite of communication and business tools. Anyone who has used WordPress will tell you that plugin compatibility is one of the things that causes the biggest headaches. This reduces that nightmare exponentially. These guys are as good at understanding the UX as they are the UI.
One of the most important reasons to consider BuddyApp first is the way SeventhQueen implemented its mobile-first responsive design. This is critical now that Google changed its algorithm to place mobile-first sites at the top of search results. That impacts your ROI. BuddyApp is one of the truly device-agnostic themes, with the mobile-first design not being at the expense of other interfaces. It's gorgeous on desktops, tablets, smartphones and other portable devices, and gives you a way to preview how what you are creating will look in each of those spaces in real-time.
This theme is worth far more than you pay for it. SeventhQueen is like having a trusted, expert addition to your design team. There's a reason their apps are the highest-rated and most trusted on the market. They've earned it and are just that good.