Thinking about the 5900 right now. I have the Avital 2way but it really sucks. I talked to a rep today and he says that the 5900 lags. I didnt quite understand this. Also does it really work up to one mile? If so doesnt that mean the battery would die like in 3 weeks?? For the people who has this alarm what are your experiences? What should I be paying around for this?