I love mine, wouldn't go through a winter without one. Not sure on the distance, maybe a few hundred feet in the open and works from anywhere in my house if the truck's in the driveway.

Yes it works with the heated seats, at least the '11/'12's do. I'm sure the new system with the MFT works similarly. If the temps are below 32, it'll kick all the heaters/defrost on when the truck warms up, above I think 85 or something (can't remember the magic # there) and it'll do the opposite, kick the AC/cooled seats on.