As a service technician for wide format printing this is interesting to me. All the printers I work on print by square feet an hour, pretty slow compared to these. As for keeping the heads from drying out, they dock themselves in a cap when not in use, and fire the unused colours off to the side (to keep all the other 5 colours from drying if only, say, cyan is being used)

For a small photo printer this is an incredible offering, but for a wide format it probably has no use. I don't know of any media that would accept that much ink being dumped on it without running. Possibly paper, but nobody prints on it, can't wrap a vehicle or do any outdoor graphics with paper!