I love that it's easy to use, has great templates for every situation you could possibly have in your business life or personal one (even if they're not related).
The only thing is there are some minor bugs with this software but nothing too serious about them as far how much work we've put into fixing these issues so hopefully those will be fixed soon by their developers team :) If any of my clients asks me what email follow up tool should i recommend then definitely give rebummping an try out :D It helps us send emails at set intervals automatically without having our staffs' hands full all day long when sending mass mails/emailing customers etc..