People data labs are a great source for business owners and sales teams to get some quality data. Once you get used to the software, it is easy to adopt and scale.

Expansive data, continually evolving, good response

The API is well documented and relatively easy to use. You can use elastic search queries to do finely tuned searches. Also, their upcoming Company Insights endpoint will be a game-changer in data analysis of a companies' health and growth.