I have a Sandisk SSD which I used for testing and stuff 'first SSD' and it now has 34TB of writes but still works perfect and really fast. Can't the extreme's take up to 250TB at LEAST until they start just slowing down?
Well, if you have it working at its best performance, then do not go for any SSD yet. It can last with you a year more or even two with that rate of usage