The company says 75 (max 85) Knots which is a nice way of not saying that it does about 140km/h.
That's not amazing for an aircraft,
(ok, compared to the 900something km/h the A320 and any typical jet of that size does it actually runs and hides and cries for its mommy)
but it's faster than a boat. And it can also do those for days until it meets its 4444km range which falls just short of the A320s range (and with just I mean another 1000km)
What you can't do with the A320, is that after you notice out of your window this:

You can just land, take a dive with your speargun (ok, probably it would be a good idea to throw something like an anchor first) and have grilled tropical fish for dinner.
The idea is to think it more like a private yacht that can also go over land, rather than a jet. The second usually being very boring things that can only go from runway to runway, adhering to a very boring flightplan. And with something like the A320 forget about doing loops. (Ultralights are more fun that a private jet, and I am sure you can fit an ultralight into your airship, next to the car, in the garage on the back of course)