Some questions and answers on Chevelle Tech for those interested.
http://www.chevelles.com/forums/showthread.php?t=308238
Sounds like most cars require the 2 Powercell and 1 Mastercell
($999) plus an additional Powercell
($349)
So right off the bat this base system is approximately $1350 which is 3x the cost of the competitors.
All the added bells and whistles are going to require additional ISIS control modules and parts you have to purchase it seems.
For the remote start and security system it's a $179 addition for the key fobs, which is close to what most alarm systems cost without install.
http://www.dealercostcaraudio.com/viper5901.aspx < 2 way Viper system you can get for $219
however the ISIS system remote has 16 possible functions, and can control just about ANYTHING it seems.