I'm wondering if any of you have had experience with the sunflex/flipper articulating mac blades--the ones with the epiglottis lifing bar?  Are they useful with a difficult airway?  I'm thinking about buying my own, but curious what others think of it.  During my residency alot of our sites were getting them right before I finished and now I'm in a busy private practice that would consider it a waste of money.  What do you think?