personally, i think an alarm system is more to keep an honest man honest anymore. If a theaf really wants your truck or stuff inside they will find away if time is allowed.
the one thing i like on an alarm is the ignition kill when the alarm is goin off (its usually an option with alarms) but it does no good for anyone to rip off your deck, personal items inside and so on. On mine i have the ignition kill and plan on puttin a no thorttle input tune in as well. id love to find away to keep the allison from shifting out of park as well by tuning or a simple way of stopping the NSBU switch from changing gears.