Has backtesting helped you?

Hello everybody,

We are new here and wanted to have the feedback of the community about backtesting process.
We created a brand new online backtesting tool, which is 100% free for swing traders, to help the community.
Indeed, we think that the swing trading style is the smoother and easier approach to become profitable, by replaying the markets and get used to them. A good way to assess profitability of trading strategies over the long run.

However, we would be interested in having direct feedback of traders to see if they had good or bad experience with backtesting, to help us to improve.
Did it help you to become profitable or were you disappointed to use this kind of tool in your learning process ?