We just got off the Encore & bought the texting package. It worked really well most of the time and kept us in contact with our teenager. There were a few times where I would have to send a message twice for it to be delivered, but overall we were happy with it. You do have to check it frequently, as you don't get any kind of pop up notice when a new message arrives.
If you can't get it to work, just head to guest services and they can assist you. Well worth it in our experience!