Does anyone have any experience with wireless intercoms for apartment door answering/unlock applications? I am thinking about this system:
http://www.cap-com.net

, but am looking for recommendations for a system that works reliably (Am always a bit leery of wireless stuff, but ripping the place apart to string new cabling is something I would rather avoid).

The only sticking point is that I have 8 apartment units, but 3 of them are 2 floors, and require an intercom station on each floor. The individual apartment units would need to be programmed to accomodate this. According to the manufacturer, the unit above should work fo this.