I was pretty unlucky at first, with Zeroin.

The tool didn't work for more than 10 minutes in a row... Had to uninstall + reinstall the extension 4 TIMES because of this...

But it was only bad timing, I guess...

Because I gave it a try some time after that... and I'm using it daily, now.

It's great, really: I'm getting several leads each day.

The export to Google Sheet function is perfect: no need to download a file to import it back to Google sheet. After that, it's only a matter of seconds for me to add these emails to an outreach campaign.
I was afraid I wouldn't find many emails, but on the contrary: 95% of my leads have a verified email address.

I mean, really verified: got a 80% open rate and ZERO bounced email.

For less than 50 bucks, some minor imperfections are easily forgiven (e.g: the tutorial is shown every single time, although I clicked the "don't show again" button, sometimes the Linkedin page must be refreshed for the extension to load correctly...)