Your "3倍" for most people means acc. time is reduced from 0.09ms to 0.03ms, so you waste 0.06ms less in waiting time per access. Big deal. When selecting SSD and for most people, if you know why you need a fast drive then you already know it. If one doesn't know why and needs to run a benchmark to convince himself, then chances are he doesn't need it regardless of the benchmark scores. The market price difference between something like 850 EVO and 960EVO can be broken down into two parts. Change of form factor from 2.5 7mm to M.2 demands a 5-10% premium, and the speed bump itself demands another 10-20% premium. There is nothing close to a 2x or 3x price. Pay the premium only if you need it, for today or tomorrow.