The Growbots interface is extremely intuitive, making it very simple to set up e-mail cadences based on leads that you pull either from their high quality database, or that you import from other sources you might have.Their support team is very responsive,...
Finds leads efficiently and imports them promptly to your Salesforce or other CRM software. Also, helps a little with market automation.
The layout of the actual email strings is annoying, I have at least 10 active campaigns at one time and it's hard to track at a high level with them all in the sidebar.
I didn't like the price per seat. This was very expensive after trail and we didn't see an ROI on it.