Revamp CRM for B2B wholesale

Disappointed to have to rate this app one star but when I hooked up the Mailchimp integration (in addition to my store) it duplicated all the contacts from the Mailchimp list, making the application worthless. When I reached out for help, no response. I wish Shopify would do a better job of screening these app developers. Can't use apps that are not adequately supported. It is a shame because the app looks like it is quite robust for the investment.