I have the Viper 5901 and LOVE it. I highly recommend it. 2 way paging system that works up to 1 mile away. I had a shop install it but bought it from amazon. I am looking to add the iPhone SmartStart feature because sometimes when I'm in the mall/restaurant/theaters the remote is still out of range because of the thickness of the walls or electronics interferences around. It does work very well though. Also I had them wire up the trunk pop so when I'm getting groceries I can pop the trunk thru the Viper remote
I'm a big believer in the blue light deter feature as well. Thieves know there
could be somebody near by and have the 2 way paging system
and that person might potentially come out and kick their butt, or be packing heat.