This saw has a 1 year guarantee. It is guaranteed to be sharp and shall cut a straight line out of the box. I personally make several test cuts with each saw. A perfect sawyer, however, I am not. The spine is guaranteed to be straight and parallel both vertically and horizontally with the handle. Every tooth has been hand filed by me personally to cut smoothly and quickly. If you should have reason to be unsatisfied with this saw, please do not hesitate to contact me. Thank you.