I was get a alarm istalled on tues . . . but wanted some feed back on units . . . the unit im looking at is the viper sst with window roll up down function and a poximity sensor. for when the t-tops are of. the window roll up/down function is good because if my windows are cracked the will roll up if the alarm is set off. I also hear that i should get the Canadian version of this alarm as it has a longer range.