I, like probably many people (especially wives/girlfriends buying for Their Guys) was dazzled by its good looks. However, I'm not sure what it's good for, unless I really need to mark 22.5 degree angles and the like. Frankly, why would I need to mark in 1/2 degree increments? Furthermore, this unit requires you to use a 0.5 mm pencil, which they helpfully supply, but WITHOUT leads. There are far better center-finding protractors (made of plastic) on the market.