Sounds like a great idea! What sort of questions did you ask during the interview?
Then a tally at the end to see what was practical to fix, commonly disliked experiences across users, etc.
The one thing I'd do different is ask for maybe 2 rounds of interviews, or longer interviews with 2-3 people to start with. The later interviews I did better, since I understood base concepts better. So I probably missed good info from the people I talked to earliest.