Highrise app is simple. You and your team can be up and running in no time, and will have a wonderful client/contact manager that is web based. The interface is friendly, information is easy to locate and update, and its a great app if all you want to do is have records of conversations with your customers, along with their contact info. Calendar and Task applications are also handy.
The app is too simple. There isn't much you can do to customize it. As your contacts grow in size and complexity, you are left with a dental floss when you really need a tow rope. You can't even make a contact record that has a husband and wife with different last names! The search option is a bit finicky and doesn't always get you the results. Email integration is cumbersome and dated with limited scope.
You may find out the shortcomings of the applications after its too late to do something about it. I mean once you've entered 500 clients in the app, and have been using it for a few months, its difficult to just abandon it and go to some other platform.