What functions does the IQ2 provide? Does it have a sound output that mimics the main panel? I would like to purchase and install an IQ2 in hopes that it would provide more alarm sounds to areas of my house not covered by the main panel.
A more cost effective solution would likely be the DSD56-ZWUS or QZ2300-840 wireless zwave siren. These two are listed on the official compatibility list for Qolsys.
The IQ2 with the most recent update mimics the main IQ , you can arm/disarm, and do all z wave functions as well. The siren and chime will also mimic the main panel or you can change them to act on their own ( eg no chime on a keypad near your bedroom)