I saw the same tool and thought it looked intriguing. However, I've been impressed with the concept of many such 'cheap alternative' tools like this one and been sadly disappointed with the 'you get what you pay for' addage almost every time. The only way I can see something like it might work is if you do a CA finish on top of it, otherwise it would rubb off in no time. Even still, how would you be able to get it perfectly straight?