Anyone have any idea the average amount of time a 510 PCC will last until it breaks or you have to replace it? Is it just one of those things where a random amount of time (say 1 day to 5 years) into using it, it simply won't work anymore? Or is there a more narrow timeframe to expect for a once fully healthy PCC? If many of them stop working well or at all after around 6 months or so I would get another as a backup.