I like that it is easy to use, has a lot of flexibility in terms of what you can do with your data (including custom fields), allows for multiple users, provides reporting out-of-the-box, and integrates well with other SaaS products. It's not free - but if you are looking at something simple then this might be fine. If you want more advanced functionality then look elsewhere.
The ability to sync up with other applications such as Salesforce and HubSpot makes this product very useful when…