I was skeptical at first since this costs a fair bit of money for a relatively small metal contraption but this is a life saver!
Can't imagine intonating Edge tremolos without this! Save yourself the hassle and just bite the bullet. Although it costs a pretty penny, this will last you for years and years. The build quality is great and is sturdy and more importantly, it really gets the job done.
The only Con would be its price. If they could just drop this to maybe around $20 then a lot more people would buy this product.
Still, this is a must have product!