if most blow is because either they over power them, or pushing them past mechanical limits. It's great to add a ton of power to a sub, adjust the gains up and bass boost to max, but sounds good for a short while. But installing them, and powering them properly, they can last as well as any other driver made. But if you do either of those to any sub, expect damage. Most of the returns are for those reasons alone...and a note stating inside saying "well I only had 3000 watts to it and a 6 cu ft box"....
damage is to be expected....