I love that you can set reminders of when your message needs to go out, which helps me greatly with my productivity because if someone doesn't respond right away - they will get another reminder! There aren’t any downsides so far in using this service as compared side other scheduling services we were trying before (iMessage/Telegram). If nothing comes up while searching senditlater slack integration then try doing an email search first since there could have been something overlooked by their team already. This saved us quite some headache regarding our workflow. We used them mainly due to ease-of use! Sending bulk emails would take hours upon weeks without these solutions but now all communications are done within just minutes or seconds after adding in sendItLater feature.