Hi Ivette,
I realize the one you mentioned is a service, not a software package, but it seems to me the same cautions apply to both. Take a look at
this thread I started last week to see what happens if ever you need to make a change in an article you submitted previously.
What happens if your clients' office addresses changes, or they get married/divorced/degreed and their names change, or they launch new Web sites later? Imagine my problem times HUNDREDS. Yuck.
And this is totally my opinion and based completely on preference, not hard fact, so take it with a grain of salt.

The service you mentioned uses one of those ridiculously silly sales pages that's practically all hype with little substance. Seriously, I had to read FAR down that long, long page before I could determine whether it was selling software or a service. Those pitches are insulting to me. I run in the other direction when I see them. They make me suspicious--why does the good stuff need to be hidden among all that rah-rah filler?