Opower Javascript Engineer interview questions

All accept 1 of the 5 interviews were all highly technical. The series of interviews were at their offices from 11AM to 5PM. I was asked to write code on their loaner laptop for random, subjective scenarios with unclear instructions that made quickly answering the question rather difficult at time. A team member told me, during lunch, that the interview exercises were something new they were working on and I was their “guinea pig”.