Since SSDs are still fairly new, there isn't a history of posts saying "I reached my writes limit on 10% of my SSD... – and here is what happened (I.e. I lost 3 directories of work files. The entire drive just died...). Maybe it starts churning as the available sectors are reduced way down - like a PC with low memory.
They tell us that these devices will only last a few years. That is frightening - THEN WHAT HAPPENS? No one seems to know. Is it "instant paperweight" or a few files here and there vanish? Or do the SSD utilities constantly monitor and warn you long before the drive dies?