I have been considering one of these for a while and believe that I should forge ahead and get one. Now the question is which model, the Professional or the Apex. I know that the Apex has some parts made of plastic, however, which would be better for occasional sharpening? Is the extra price of the Pro worth the sturdier construction? Can I achieve the same consistency with either? I thought that the Pro was for someone that either sharpens knives for income or uses their knives hard, but I have noticed a lot of folks on this forum have bought the Pro. Your thoughts and opinions are appreciated. Thanks.