Well I was looking into an SSD, and as I format my PC whenever the mood takes me or a nice fresh install is on the cards, endurance was a factor. The Samsung Evo Pro 840 (256GB), Kingston HyperX 3k (240GB) and the Corsair Neutron GTX (256GB), had all made it passed a Petabyte of data writes.
Hopefully the Samsung 850 would have no problem in doing the same.
If I am going to buy an SSD I would either splash enough for a fast durable OS drive, or I want oodles of room.
And .50/gig, £/$1000 will get you 2TBs worth. Insane as a storage solution.