Wade, I think the best answer to your question is the cost: an extra $2 or $3 thousand can be the dollar cost difference for some folks, especially those that are not on the tournament circuits and have sponsors help to cover their expense...also coming into play could be the overall weight of the package with regard to total hull weight acceptance for load.
With the new Mercury 4 Stroke 150, it should help fit both ends of the spectrum for many folks; time will certainly tell. It may not "troll down" to speeds that tournament guys will require, but overall, I think most weekend and vacation anglers will find it a good fit.
I will say this; from a point of safety, especially on the Great Lakes type of waters, I myself prefer having a "kicker" motor; just to be able to limp home if the main unit breaks down. I have been with boat kinds of units, you just have to decide what makes the most value for your needs!
Lou
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