A lot of good discussion here and anyone reading the posts will gain valuable knowledge that can be used to make important equipment decisions. I was in an archery shop a few weeks ago and the owners were discussing how legalization of mechanical's in Oregon is going to make it so much easier for newbies, since they "won't have to worry too much about tuning their bows with mechanicals." In my opinion, there is no substitute for finely tuned archery equipment. The most expensive bow, arrow and broadhead combination not in fine tune is subject to performance uncertainly on large mass animals no questions.
I agree with that, but I’ll say the benefits are still there with a perfectly tuned bow. Take a perfectly tuned bow, and throw a glove on, or stand on a sidehill, or shoot from a sitting position and shoot that same bow through paper. The effects of grip torque or anchor differences based on a variety of conditions will show up in tune, and affect arrow flight down range... most specifically with a fixed head.
I love fixed heads, have shot mostly them since beginning archery. That said, there’s certainly scenarios, even with a well tuned bow, where less directional input from the front of the arrow proves beneficial.
I’m still not certain which direction I’ll go this year. I’ve had great luck with QAD Exodus fixed heads, but I’m becoming a believer in the Grim Reaper mechanicals as I gain more experiences in the field with them.