As a Robin DR400 owner I regret to say that I would not use one for any enterprise that was intended to make money.
When I went into the aircraft leasing game I was all set up to support a Robin operation From maintanence of my private Robin I had all the manuals ,control rigging tools and a number of other bits of kit but despite this I could not see how I could make any money with the appauling spare parts support that the factory is renound for.
I went down the Cessna / Piper road with much regret as the Robin is without doubt the best aircraft to fly.