Fabulous is one of my favorite registrars. I don't think they get the credit they deserve though. They have super low prices for .net names. The lowest I've ever seen. Their backend is super fast and easy to use.
The only cons are that they don't have a Whois Privacy feature. So I actually don't have that many names with them.
They are included in my favorite registrars which include GoDaddy, Moniker, Answerable, and Fabulous.
If Fabulous got a free whois privacy like Answerable, i'd probably move ALL of my names over to them.