I have been long time user of 1and1 for domains. Their initial product offering is always sweet (free, 1$ domains) etc. Their renew rates are not bad as well.

But the place where I hated them most was NS change propogation, it took 24 hours to get that done.

Also their admin panel is awfully slow.

If you guys don't already know it, here are some of the links to help

To transfer/cancel domains you must go through : http://cancel.1and1.com

Admin: http://admin.1and1.com