I've spent the last 2 days using Muraena (tier 5) and I'm happy to recommend it. You can output a massive amount of data at very low cost.

About 80% of contacts have email addresses. And the verification rate is a bit higher than average.

The search functions have room for improvement. But Vlad was very responsive and I got the sense they are actively improving the product.

Overall, my experience has been great and this is the perfect tool for some use-cases.