I had mine installed by Xtreme Performance (http://www.xtremeperf.com/contact.html). The unit also includes remote start, but they recomend a different unit for remote start.
I have my windows open with the single press and hold. You have to wait until it fully cycles before you can start the car, it leaves the car onefor an extra minute after it is done. I had the unit get confused.
I just had to have mine replaced, it started going nuts -- it kept trying to start. I had an early version, w/o the 1 touch down feature.
Though it was out of warranty, Luxury Motor Works gave me a break.
Since they were intimate with the SC430 wiring, I asked them about an input lockout bypass. They told me that they tried (before) to bypass the input lockout, but was unable to get the bypass working correctly. Of course, if they were able to, they would have something else I would have bought.