Main issue is, like any dct, the gear box. Do the usual drive and see if it's shuddering or hesitating.
A pre purchase inspection is a must, but at a private recalls specialist. The dealers probably won't care or know enough.
FYI it's basically a Nissan Juke turbo underneath so very reliable. Bizarrely on the Juke the accessory belt doesn't need changing but it is required in the Renault.
Do you have a link to a car you're looking to inspect?