It' s a trade off....

Big, fixed blade head mounted on a slow moving aluminum with chance for tuning changes in the bow resulting in changes in point of impact as well as smaller margin for error in range estimation.

or,

smaller, carbon arrow, mechanical head design flying just like field points with little tuning effort, greater speed for larger range estimation flexibility and little to no chance of change in tuning effecting arrow flight or plaining characteristics.

Bottom line, if for some strange reason they don' t open, which is probably just as likely as your bow coming out of tune and your fixed blade flying off target, your deer will be just as dead as if the blade opened.

For the average guy, using mechanicals is a whole lot easier than using fixed blades and 99% of the reports of lost deer are probably just bad shots and a lack of tracking skill.

Jeff...U.P. of Michigan