I use them as well and have had no issues; however just because two of us have had no issues, it's not much of a data point.
It works both ways though I think, the same steps they take to secure your domain are the same ones that will make it hard for you to get it back.
Aside from the security features, Moniker's site and technology seems to be fairly unimpressive.
I'd definitely be open to exploring other options if people have suggestions for truly-safer registrars.