Im running a samsung 840 pro 512gb SSD as my boot drive, and i have a 3tb and a 1.5tb for storage. I havent had the SSD long enough to really give any inout on longevity, but i do get bootup times of 10 secs from power-on to usable desktop ;)
I think the main thing in the longevity is not packing the SSD to its max capacity, thats why i have these other drives.