Interesting. I also used to be a car audio installer back in the day and have installed alot of alarms. I wouldn't do the window modules myself. I was looking on EBay at the 5305 and it didn't say anything about smart phone use. Can you use iPhone or just Android?Yes, installed it all myself. The alarm/remote start, bypass module, smartstart module, and 2 window modules cost around $345 all purchased from ebay. I paid $15 to a guy on ebay to activate my smartstart module (only DEI dealers can). I probably used $30 in material (connectors, wire, relays, etc.) so grand total of right around $400. I used to be a car audio installer in my younger days but aside from running wires in all 4 doors for the power window modules I would say this wasn't too difficult of an install.