i have a DEI alarm installed on my sy. its more commonly known as a viper/python/sidewinder alarm. i cant really say if its the best alarm out there, but it does have a lot of options. i got my alarm with, window control, and remote start. i also got a pager with the alarm, so if the alarm goes off, you get paged with a 1-3 code. 1 means the alarm was triggered, but not fully activated. 2 means the alarm was fully activated. and 3 means the door sensor has been triggered and lets you know someone has gotten into your car. also later this year DEI will be releasing a new feature similar to low jack, that has a vehicle tracking system for theft recovery, and like the onstar system can unlock your doors for you or activate your alarm to help you find your car if you cant remember where you parked. overall the alarm has a lot of features, you can pretty much hook anything up to the alarm, to be activated at the push of a button. strobe lights, underbody kit, stereo etc... eventually im going to hook up a couple lights for the inside of my bed, which will be wired in with the alarm. so if i dont lock my tonneau cover, and someone lifts the cover, the alarm will go off. or if the alarm is off, and i lift the cover, the lights will turn on, and turn off when i close the cover... gotta love technology today... so much shit can be done!