I'm very pleased not only with the service Roadrunner provides but have found their pricing to be very competitive. Like others have mentioned, courteous, informed employees, fast delivery (only 2 business days and I'm in Virginia) and my cat loves the little toy they include with each order/refill.
It's not a criticism but a wish for them to improve their website so reordering can be done with any credit card, not just the one they have on file.