Experience with NextAlarm?

Wondering whether anyone out there has experience using NextAlarm? They can redirect your ADT or Brink’s alarm hardware to their service center, and provide Internet-based monitoring of your alarm. They’ll e-mail alerts, provide online account access (two things that ADT doesn’t do) and they’re far less expensive than ADT. I’m pretty impressed so far in checking them out, but would love first-hand reports if anyone has them…