At work we currently have our domains at dnsimple and one.com. Of which dnsimple provides a great service, with a good interface and fair business, but unfortunately does not currently or plan to provide support for acting as a registrar for .se domains which removes it as an option for us.
This made me research into options that has more breadth than dnsimple and ended up choosing Gandi, after registering a large bulk of domains I must say that I am happy with that choice. I had about 3 different questions which required me to contact their support and each of those questions were resolved within minutes. The only negative thing I can say about them is that their web interface is a bit slow.
But I fully understand why it is hard to find negative reviews about Gandi.