We also use the GE systems as our go to system. The only downfall that we have run into is that it is highly recommended to run the security system on their own processor (QM-RMC). This has been suggested by three different people I have personally talked to as well as on the yahoo groups forum. We did find a loop-hole and that is you can't use the newest processors (DIN-AP2, PAC2, PAC2M, MC3?) to control the system as the processor freezes and must be reset. The QM-RMC was the suggested one to my by the 3 people I spoke with and is also the cheapest. The module is already built for it and works perfect, even with adding partitions and extra zones to the original module.

Providing all the settings are set correctly on the GE system you will have no problems.
Just a note that this is not a System builder friendly module (although there is one on Yahoo groups) so having some knowledge of Simpl might be required if you need to change the module in any way.