We have had great success using SkyConnect hardware and SkyNet AIS software. The SkyNet software is a very nice upgrade from the stock SkyConnect Mapping.
We have several alerts custom built into the system mostly dependent on our business rules.
We are very particular about knowing what the pilot intent is and then seeing that it is being followed. We use our own radio repeater network as well as the Sat phone and Text messaging quite extensively.
By implementing text communions we have reduced our radio calls by over 80% which has really helped.
We follow about 90 aircraft daily and handle an extensive amount of message traffic from several locations around the globe.
Our aircraft have to have the ability to change plans in flight so this system has been built to handle that as well (which is one of the biggest problems you encounter with this type of software)
It's not cheep to implement but if you need the versatility SkyConnect hardware with SkyNet software may be what your looking for.
I am not a salesman or do I work for either company but if you want to talk to one send me a PM and I can get you their information.
BTW long time lurker, first time poster