The leak issue is not particularly common, however the rubber membrane can fail at any time. If your water has any special pH issues, that could be part of the problem. Remember, nothing lasts forever, and routine wear will sure make Murphy's Law your slogan to live by. I've replaced over a hundred in the last 20 years, and no brand seems more likely to fail than any other..... Feel lucky you could replace it quickly!
I have had 4 of my own fail at: 7 years (120 gal tank), (2-80 gals at 6 years) and a 62 gal one at 4 years.