"i have yet to use this in 'anger', however from having a good look & play with it i can see it is a good tool. it has a small lock on it so you can lock the rule in place which is very useful. the rule slides well, and i can see that it will last a good many years provided it is used in the correct manor. it is plastic and I'm sure you could destroy it fairly easily if it was not looked after. however since this item should only be used to set the height of a bit, it is more than capable of doing that. easy to read, slides smoothly, and its lockable, what more could you want?"