I've been building WordPress sites for nearly 6 years now, dealt with many different vendors, plugin makers, support, etc. I've experienced anxiety and frustration, had to wait a lot, going back and forth with meaningless questions, meant to put the responsibility to somebody else. Like many other designers/developers I guess. But since I found out WPMU Dev, I can safely say that there isn't anything nearly good as those guys! Not only they do the job every time I need something, but they also do it quick. And honestly, they even have a way of making you happy when you communicate with them :) That's for the support. But also great are all their plugins, their hosting service, their blog and the knowledge base. This membership really helped me elevate my work substantially and boosted my business. Highly recommended!