There are two manufacturers of the mechanical pushbutton lock. The article referenced is a couple years old and Kaba says they corrected the problem in Nov. 2011. The other maker says theirs is not affected.
In my opinion, this type of lock is still hard to beat on a handgun safe. No key, no batteries, easily opened by feel, quick, reliable, and durable. Get a handgun safe made of at least 10ga steel and bolt it down.
FAS1 SAFE Video Clip