I'm on my second 300c. They had to disconnect the remote because it was having prblems with the electonics in the transmission. They said they had a fix..i turned the car in before they had the fix. So now i have a new 300c and a remote that is hooked up..so far no problems but iv'e only had it 3 days and 120 miles.
I had one on my old 92 Park Ave after market and worked well. A pretty useless item though unless you want to warm it up in the cold weather. Keyless go with a start button and auto locking is a whole dirrerent story not available for us. The new caddy XLR has no key slots anywhere, not on the door, trunk, or ignition which is better than MB (I think) and Lexus which still requier a big plastic fob to be plugged in the ignition slot just like a key.