I like the fact that it allows one person to do a lot of things themselves. No longer. Hey, you can hold this or that. It's much easier to measure when you frame. It has many useful features and comes with instructions. It holds the chalk line and is well suited for use on intersecting walls. Also works well when placing the sole on cast in metal posts. he has a way of accurately measuring them. It's basically an advanced speed square. If you add all the features it has, you will become addicted to it. Good product.