I transferred my domains from GoDaddy to 1&1 and had a bad experience. So I sent them this letter. We will see if I get a response.
To: firstname.lastname@example.org, email@example.com
I recently transferred my 5 domains from GoDaddy to 1&1. I chose 1&1 because I know you have been around for a while and your pricing was great.
During the transfer process it was not obvious whether you would keep my current name servers for the domains or if they would be changed to the 1&1 name servers.
It was also not obvious how to setup non-1&1 name servers during the transfer – it may not have been possible at all.
When the domains transferred the name servers were changed to the 1&1 name servers.
This caused all my web sites to go dark and all my email to stop flowing. Needless to say, I am not happy about this.
Additionally the TTL is set to 48 hours, so it will be up to 2 days before everything is working like it should again.
I just want to express my displeasure with the way you handle domain transfers.
For a new domain purchase it makes sense to park it at 1&1 on your name servers.
For a transfer you should either default to using the existing name servers or you should make it really obvious that you will be changing them to the 1&1 name servers and also make it really obvious how to change them to my specific name servers during the transfer.
I am not new to domain transfers or DNS. I have been working in the IT field for 12 years and DNS and domain transfers are part of my job. This is by far the worst experience I have had transferring a domain between registrars.