Anybody use them?  Interested in hearing your thoughts on them.
Are they as easy to tune as the Trads and Trad Lites?

they work great for me!

been using them for several years now. Love 'em.

I use them with heavy heads up front. Out of my 60-65# @ 30" Longwalkers,They are tuff on critters.
I had no problems with tuning.
Great shafts

I have some Hammerhead Trads.  They are comparable to a 55/75 spine.  I just barely got them to bareshaft out of my 64# RER.  I have a 175gr head and insert bushings up front with the standard aluminum insert.  The back of the broadhead is right at my finger when I reach full draw.  It may be due to the taper, or how hard an RER shoots, but you might need to get a slightly heavier spine than you think or buy the test kit.

They fly great.  I really like them.  As far a penetration goes, I can measure how much arrow is in the dirt on the back side next time I shoot a deer, if you would like...    

God Bless,
Nathan