Re: Space, not cost...
"Now I can buy half as much again in a single 2.5" case with better performance."
(5 months later, when I have real pricing and specs)
Half as much again, in a single 2.5" case with 10,000 times the performance (conservatively) and at 7% of the price of the array I purchased 12 years ago.
Oh and it draws 4watts max(ok, 100 watts wrapped in a server), vs 5kW