In reply to Brett Blevins.

I have similar experience with infiniteWP. Its good solution and do all necessary jobs - manage, update, backup ... but somehow it some kind of magic for me how it works, backups and restores sometimes disappear without any error, just it delete files and datas ;)
Its fast and managing many websites is easy, but I m really not sure about security and stable of this.
Did not tested managewp longer period, so can not say if that service is more stable and secure.