Anyone in Chicagoland area have a Remote startup aftermarket Alarm System in their car installed in Chicagoland area?

If so, how much was it? How long did the install take? Are you satisfied?

Another question. Would an aftermarket alarm mess with the option of unlocking twice (hold second time) and having the windows drop? If it does than can it be wired to remain an option, and can they do the same for locking twice and having windows go up (not an option as of now)?

Thanks in advance guys!