Unyieldingly hospitable support.
I've been a customer of WitherHosting for a year now, and their support used to be the best that I've known when I first started. They have only gotten better. You are treated not just as a consumer, but also a customer. From those with technical backgrounds with complicated questions--to the newbies wanting to make a small server for their friends, they have made things not only accessible, but also rewarding.