I got those class action notifications in the mail, I had two of them, a 2006 and a 2007. The claims I think are valid, there was a software update which limited battery use and as a result made the mileage noticeably worse after the update. Also, part of it was regarding poor battery performance, in particular after another software update. My 2007 gave me the battery code of death with less than 20K on it and after I got the software update the car was terrible. And of course they didn't replace the battery they just updated it and said if the code came back they would. I'd sold the car a while back, but I did send the claim forms in.