I have not taken the Hiram Bingham. I've heard from other tourists that it wasn't worth it. They enjoyed the experience, but they didn't think the experience was worth the price of the ticket. When talking to friends that live in Peru they seem to have really enjoyed it (but they've gone to MP 4-6 times). There are several videos on YouTube showing the experience and TripAdvisor reviews.

I've done two round trips with the vista dome and have always enjoyed that experience. I don't think there is any chance you will feel you got your money's worth on the HB. If you aren't concerned about money go for it... I think it will add to the experience and will be memorable, but if you are already worried about getting your money's worth out of the experience you will be thinking about that in the back of your mind the whole trip.