[removed] has updated its reliability stats for the Cobalt to include owner experiences through March 31, 2013.
Repair frequencies, in terms of repair trips per 100 cars per year:
2009 Cobalt: 27, low
2008 Cobalt: 28, low, small sample size
2007 Cobalt: 43, low
2006 Cobalt: 44, low, small...