Keep in mind that heads like the Montec have to be hand sharpened...not a skill that many have/can mastered ...and its not done with the kitchen knife sharpener...and to do right it takes considerable time !!!
Any broadhead should be "Topped up" regularly with quiver use and deifantly after any shot...they should shave hair with ease...there are Broadhead sharpeners that give proper angles and use diamond grit...
Even with those many dont do an efficent enough job IMHO...
The Heads like the G Striker has replaceable blades..sharpper than a surgeon's scalpel right out of the package and only takes minutes to change...
Something to think about...
Neil