I was referred to Modular DS from a friend and while it's early days (as I add a few sites to test things), the current feature set for the management of WordPress sites is really nice. A slick user interface and a very positive experience in my first few hours with the app.

I can see 3rd party offsite backups are being worked on and if the service continues to be developed with new features, I can see this being a key player in WP management space (and it will be well deserved IF they can make it to that position)