I manage sites for 25 or so clients. I host all of them at WPEngine. Not cheap, but very, very, very reliable and helpful.
I hate to have to manage my vendors, making sure that they are doing what they are supposed to be doing, making sure that they aren't down, etc.
For me, with vendors like hosting providers, I want them to be like dialtone (back in the landline days). What do I mean by that? Well, you never had to manage dialtone. You never had to wonder if it was working. You never had to call the phone company to check on them. It. Just. Worked.
WPEngine has a lot of other virtues too, besides reliability.