If you get a Remote Start, get an aftermarket unit. The Mopar one is annoying on a number of levels. The most annoying thing is that for diesels they enforce a 45 second wait to start, with absolutely no chance of programmability. I live in Southern California, and don't even know what my wait-to-start light looks like because it never comes on. All the aftermarket ones I've heard of either have a programmable delay or can be tied to your wait-to-start light so that they can start the engine as soon as it is ready.
The other annoying feature of the Mopar unit is that it won't work if the engine has thrown a code. These engines do throw codes every now and then, particularly if you do much in the way of modding.
The other thing is that it doesn't come with a manual. I've called Dodge, and I've had my local dealership open up a brand new box and look for a manual to photocopy for me, and it just doesn't have one. It seems to take some sort of double click combination to make it work, which is alright I suppose, but I would really like to see a manual, and it doesn't exist.
I'm so frustrated with my Mopar R/S that I am seriously considering tearing it out, throwing it away and starting over. I think I've managed to start my vehicle remotely twice in the 10 months I've had it.