I switched to Badger about a year ago. I think I switched when they "launched" via HN and haven't had any reason to switch. I'm not the heavy user most on HN are, but everything works, its easy, and I don't get annoying sales (spam) emails.
Badger does one thing, and they do it well. They also have a kick-ass API.
badger.com is the only non-sucky registrar i've ever used.
Wow, trial admin is a good idea. If the actual admin panel is as fast as that demo is, I'm impressed.
We mocked out the API layer to achieve the demo so it'll be slightly slower when it has to make real requests to our API. That said, the live version is quite snappy!