Grinder gashes always are slow to heal, by the very definition they removed some of your hide! And often introduce and leave behind contaminants in the skin, just an all around nasty wound. And every single time you do it you think to yourself, dang it, I am smarter than that! Never stops me tho!
Ridged makes a good cordless grinder. BUT the switch is in a bad spot, I caught my finger in a metal cutting blade. It cuts fingers just as well as steel