Thanks for all the input so far.
I was a bit of a non believer in mechanicals but after purchasing a new bow and switching to carbon arrows I had a very difficult time getting fixed blades to fly with any consistancy. After much time spent trying to tweek three different brands and styles of fixed blades I tryed the NAP Spitfire mechanical.
Since the switch I have harvested 4 deer. With all four, including a doe this year that was shot a bit too far forward, the Spitfires performed flawlessly. I am a believer in them for whitetails and the confidence they provide in my accuracy is hard to measure but it is worth a ton in the field. Nothing replaces time spent practicing and I have more time to practice now that I do not have to tweek my broadheads.
I do believe that fixed blades continue to be the better choice for most situations especially tough skinned and mean animals (hogs, buffalo, rhinos, elephants,lawyers, etc..). Thanks again and good shooting.