As a scheduling tool for social media its best at Instagram. I can schedule a whole month's worth of posts. If something arises that needs to be posted immediately it accommodates for that as well.
The only feature that they do not have right now is for multiple pictures. If you wanted to do a multi picture post you have to add one picture to buffer and add the other ones manually in IG.
Just try it out and I assure you it will change your life! Spend 1 or 2 hrs in the beginning of the month and have content ready for posting for the next 2 weeks. Great scheduling tool.
It helps me automate my social media posting. I can schedule posts and have them in queue for whenever I am ready to post them. I think that is very useful!