I can pick up 6-8 chains per week from from a friend and neighbor that logs on his own. All chains will be 3/8 full chisel, so I won't have to constantly change angle/size between chains. I assume I'll be able to set and run? I plan to buy either the 511AX: http://www.northerntool.com/shop/tools/product_200354876_200354876 or the 510A: http://www.northerntool.com/shop/tools/product_200381699_200381699 unless someone here has experience with another grinder I should consider? Can anyone comment whether the 511AX is worth the extra $100? Is Northern Tools price in line with other sources you're familiar with? Will I have to change wheels to adjust rakers with these models? If yes, how about a cheapo Northern Tool grinder set up to just grinder rakers? Thanks very much for your input.