Whilst the storage is expensive its very fast and means you can avoid expensive monthly cloud subscriptions by retaining data on your card for longer without overwriting.
We recently did an exhibition where a fast storage device would have really come in handy allowing large storage of 4k videos from our photographers SLR camera and then direct transfer to the projector for instant playback (although transfer needs to be done via wire as most portable projectors use micro SD or USB but it does mean you have more freedom to take videos without constantly transferring).
Price: £479 / $435 / $479