I wanted to give some feedback and my experience thus far with the tool. I have not had any issues with it, but on S&W pistols, it does tend to wear the "push block". I have installed 4 sets of S&W M&P sights (1.0 and 2.0) and have to say that they are the tightest and hardest to press sights I have ever seen. Two of the pistols made loud "cracks" when the sight initially moved and none of them were easy at any stage, they were stiff throughout the pushing process. There is no way that you use use a hammer and a punch to remove or install these sights without breaking something or damaging the sight or slide.
I have two sets of Walther sights to install next and it will give me something to balance the S&W's against. Certainly, Glock sights are easy to push as are HK sights as compared to S&W.