...and have the nice experience that your registrar removes your DNS records from their nameserver the same second you click "submit" to change them to somewher

...and have the nice experience that your registrar removes your DNS records from their nameserver the same second you click "submit" to change them to somewhere else. Been there, done that. (It's the main reason I won't use 1&1 [yes, the German company, NOT the 101 the OP mentioned] anymore)