I've been a customer for over a year and I'm very happy with this tool, which allows me to monitor my customers' sites at a glance, manage updates, backups, etc.
The BIG plus: HYPER-responsive, attentive customer service.
WP Umbrella is an excellent solution for managing multiple client websites. It's superior to all other options on the market and in every way: performance, reliability, usability - the whole nine yards. Really very impressive work from the WPU team, and certainly a company and product I'm thrilled to support.
5-STAR customer support! Ongoing development is encouraging. Finally, someone is bringing site management into the 21st century. Smooth, fast interface, etc. Great job. I've moved all my sites from managewp to wp umbrella!