I'm thinking of buying the mailing list add-on but I want to make sure it will meet the needs of my client. My client simply wants their admin to be able to email all the registered users at any time. They don't want a subscribe box like in a traditional mailing list. It looks like the mailing list does do this from what I can tell of the screen shot but I wanted to make sure before I actually buy it.

Any other feedback on the list?
Thanks.