www.bbc.co.uk/news/av/world-europe-54394128
Obvious first place to deploy it - health and social care staff. Possibly even at the start of each shift. Much better than the current system (my DH works in a care home) of have a weekly test, wait nearly a week for the result.
Could allow resumption of concerts and theatre etc if everyone was tested on the way in. Would you pay a fiver more and wait for 15 minutes, if it meant you could go to something you have really been missing? I would.
And as they appear to be using it in Madrid - test everyone in areas where cases are rising rapidly. That way you can find the asymptomatic people and get them to isolate, thus damping it down much much quicker.