Apparently this is the place to exchange a wad of your £/$/€ at a good rate, quickly, on arrival.
But do they stay open until all the night's flights have come and gone? And will they change back Ariary on departure?
These days I feel cash is the way to go. Traveller's cheques are almost obsolete and ATM charges rack up fast when the limit is only €75-150 in Madagascar. Cash earns the best net rates so long as you keep it safe!