All I am going to say is I am pleased with my results and when I trade I am very relaxed.
Jigsaw tools are just tools. There is no "system"; it just has more information than the typical dom or tape found in ninja trader. It will show pulling and stacking of limit orders. It will show a daily volume profile and accumulated volume at price and individual trades at price. The tape allows you to filter out smaller trades. I find the information helpful. It can take a long time to understand what you are seeing on the Jigsaw dom.
I am not doing what Grady does; he is trading the bonds for a couple of ticks. I have watched his videos and some of the information helped me but I am not interested in his style. Peter Davies has an interesting approach to the ES but I don't trade the way he does either.
I am using jigsaw tools along with other tools (footprint chart, volume delta, volume profile and a 70 tick chart) trading the 6E futures contract. I am looking for short term movement but the term "scalper" may not be appropriate. My initial targets are 10 to 20 ticks and will take more if I can and less if the order flow tells me to get out.