After extensive research I chose the Hitachi roofing nailer and was not at all disappointed. The nailer proved to perform excellent under all conditions. No matter how fast I went it did not misfire or jam. The only time I did have a problem was when I went to use it for the first time. After it was "broke in" it performed excellent. My roofing contractor said that he would buy it from me whenever I wish to sell it (he had to try it out also). I am very satisfied with the purchase I made and have no buyers remorse on this item.