I don't know what most of those numbers mean but most of them are 0 and the overall assessment says "Disk is OK", so I guess it wasn't used much in the past two years. "program-fail-count-total" has a value of 94669670143499 but I'm not sure if that's actually bad or not because "program-fail-count" is 0.
Also, as I stated before, I'm still going to prioritize my slower hard drives so I'm not stuck with them if the SSD fails before I can buy a faster drive.