I have been a member of WPMU DEV since 2011. It is the ONLY company where I look forward to paying the annual membership fee.
WPMU DEV is one of the top companies in the WordPress community today because they had vision and foresight when WordPress was in it's infancy -- that WordPress was going to change the "how" of website development.
WPMU DEV has 350+ Plugins and Themes, and every one of of them is an amazing tool. I've installed many of their Plugins and, for the first time, recently added the Fundraising Plugin to a nonprofit client's site.
From my side, there were no hassles getting everything set up. On the nonprofit side, I was easily able to set User Permissions; giving the bookkeeper and Committee Chair the perfect level of needed access. They were so impressed by being able to run their own Crowdfunding campaign, that I have been hired to completely overhaul their website.
WPMU DEV has given me solutions to offer my clients to help their business growth. I have become a "one-stop Plugin shop" for much of the code that only a few years ago I hired out to programmers.
My business offers e-commerce, blogging, social media, fundraising, email marketing, event, membership and appointment management -- SOLUTIONS. So, thank you WPMU DEV! I look forward to seeing that it's time to pay my fee.