After I reviewed recent orders the app is stating he was assisted, I found out that only 2/8 orders have been really assisted by it. This is because the way the app is marking the orders as 'assisted'.
You must be very careful while setting up the app in order to avoid the attribution of an order coming from another app or campaign.
From my initial experience, I found out that the app was marking as "assisted" all the orders where an email that the app sent to was used when purchasing.
Changing the attribution window of Abandoned Carts from Settings should solve the issue but you cannot manually do this for Winbacks.
In my case, 50% of the recaptured revenue was from Winbacks. But looking at those, I found emails sent 1-2 months ago and orders done only 2-3 days ago. So the app marked as 'assisted' some orders for which it sent mails months ago but in reality these were only my usual returning customers and were not buying because of the Recapture campaign.
Watch careful the orders the app is marking as "assisted" and report any that you feel it's not really coming from it, especially when you have multiple retargeting campaigns going on, like Google or Facebook ads.