First, they are great people to work with. When I wanted to get a set of components for my M&P 45, the developer had me take some measurements and they made up set for me. He even called me twice from Athens Greece to make sure I understood what I needed to do.
Next, I am still evaluating the product. I am simply not proficient enough with any pistol to properly make any judgements yet. For me, the issue is, does it improve the split time for multiple shots. I have a timer, but my lack of proficiency make the results inclusive to this point.
Finally, they have a great money-back policy. So there is little risk in giving it a try. I personally will keep my set because I requested a special effort on their part.