Newsletter: Constant Contact v Graphic Mail

I'm currently trying to get a newsletter out, using an online service.  Two different people have recommended, respectively, Constant Contact, and Graphic Mail.  The latter has the appeal of being priced in $NZ, and having newsletters as microsite, and allowing text alerts.  All good.

The former, seems a bit easier to manipulate.  Graphic Mail seems to be having a few problems today - my confirmation e-mail didn't come out, but then the online help sorted that out really quickly.  

I'm still working on it - any feedback from satisfied/dissatisfied customers most welcome!