I wonder if they will be able to make their prices competitive outside of extreme markets like New York City.
For example, their minimum package costs about as much as 2 square meters of decent residential space where I am.
Of course there are people who are willing to pay a premium for the flexibiliy and often they have good reasons. However I am not sure that the market of people for whom this is superior to using their own space or relying on conventional storage companies is all that big in most locations.