When JustHost took days to respond to a ticket, and then replied with a generic form letter that didn’t even apply to the issues I raised, I figured it was time to try a new host. Hello, WebFaction!
Update 3/21: I’m really impressed with WebFaction. They’re speedy, the control panel is simple and straightforward, and it’s been a piece of cake to move my ten domains and sites over. Setting up the two WordPress sites was a breeze, and they even provide a simple installer for mercurial. Really, the only way this could be easier would be to have a lovely and talented assistant who would take care of it for me.