A few things that make it less good value:

- Its not new tech, its greenhouses with indoor lighting

- Its an enclosed large monoculture of plants, which means you are prone to pest and fungus. [see note]

- It has a very large electricity demand (heat and electricity)

- It is labour intensive.

[note]

growing plants in the city is difficult, mainly because the food triangle is so distorted. In central london there are loads of aphids from the lime trees, and lots of powder mildew.

Now considering these setups are aimed at green leafy rapid growth plants, you're going to be spending lots of importing ladybirds. (not much you can do about powder mildew though)