MBWorld.org Forums - C63 ignition problem

so a couple of days ago i bought my 2011 c63 used. i was getting into my car after lunch and i try to start my car with the push button and it doesnt. i get a message on my display saying change battery in key. i then take out my push button to start the car with just my key and the car still does not start. the same message appears on the display. i decide to walk to my mercedes dealer and get the battery replaced. i get back to my car and the car still will not start with the push button or the key. i call a tow truck and get my car towed to the dealer. the dealer called me yesterday saying they needed to replace a part in my ignition module. thankfully the part was covered under warranty. so basically my question is, is this something i should be worried about??