I checked the tool with the keywords "web design" and "machine construction" and it does more or less what it says so far so good ...
But... if you are looking for leads in other countries with no local market of 330 millions like the USA you will be disappointed.
Example: I searched for web design in Madrid (Spain) and got 0 leads. I searched for web design in Zurich (Switzerland) and got 4 leads.

With the standard plan you have a) no access to the advanced search capacity what decreases the result of the output in about 70%!!!
With the standard plan you cannot effectively search in other countries (I checked Germany, Switzerland, Spain) as you want get just a couple of leads because of the district/country restriction of the standard plan. It sounds somehow ironical that the message in the software invites you to increase the search area or use a wider description of the term "wider than web design...?), To resolve this issue you are invited to buy the Business plan with a yearly fee on the search result site.

This is somehow disappointing and reduce the effectiveness of this tool for other countries close to 0!!

So I give 2-3 tacos because it does not what it says. Nevertheless it works much better for the ones that only want to scrape mails for the US market.