As a large charity we started using WPMUDev's plugins as a means of better managing our sites that are hosted on premises. We continue to host our own sites but WPMUDev's ecosystem of plugins and their support has been outstanding and are essential to the proper maintenance of our web assets.
There customer support has been responsive (in particular their live chat has been tremendously helpful), they've been patient, I've watched them chase down problems in real time, and we've had outstanding customer support throughout. We don't use them as a hosting provider but they make us feel like we are. Tools like defender, snapshot and hummingbird are keeping things running smoothly and efficiently.
It's like having our own web development support team working for us and with us. Thank you so much for your work.