Overall I have to say I'm very happy with Dynadot. The prices are reasonable (and better than my last registrar) with some nice additional features such as domain privacy offered at a great price compared to other companies.
The Account Area itself is straight forward and helps make everything easy to manage both quickly and efficiently. It's easy to find everything and when all you want to do is quickly manage a few domains, it's a blessing.
So it's all round very positive feedback from me! I'd recommend you to anyone else I know who is looking for a domain registrar.
Minor Suggestion- I love the clear and concise design for the Account Area, but there are times I feel like a little extra to guide the eye would be handy when there are lists of information . (Ie: Manage Domain Names, Contact Records, etc). Example of this: http://img293.imageshack.us/img293/8517/domainlistrl1.png
But I know everyone has a personal preference, so I'm probably in the minority! ;)