i agree compustar is the best.
i have the viper5901, there's nothing wrong with it and it does everything i need. installed it myself and got the unit for $200. i didn't go thru an authorized dealer so no warranty for me. i didnt want to spend $1000 at some dealer. haha.
only thing that i hate is the buttons on the 5901. they wear out and u have to keep pushing harder on the buttons. very low quality. $100 for another new 2way. :redbrick:
if i had to do it over again, id go with compustar.