It makes sense for Klarna to offer a lease to carry to the end with no interest attached - as a constant stream of cash flow, while the liability of the device has been insured by Apple, and Apple is kicking back money to Klarna for the depreciation and/or interest monies....I wonder what the incentive is to Klarna in order to keep the lease running the entire duration.
That said if Apple Upgrade is administered through Klarna that would be reason enough for me to be extremely cautious about using it.