[Dearth]

Late to the conversation but my take on Apex I do not have the wireless version so some things may be different

PRO

Very reliable
Easy to maintain
Compatible with most major brands
Can view it from anywhere in the world and make adjustments any time
User interface is mostly friendly and easy to read
Expandable
Easy to follow video tutorials on the Apex site
High resale value

CON

can be a right royal pain in the arse to program
Expensive
Updating can be an adventure
The cable connecting the unit to your display panel is very thin easy to break
Expensive to expand need more power bars and units to sync up meaning more cords equaling more clutter
Not compatible with some of the more popular brands


Over all I love mine but it can be a pain too