What does Buffer do well? Buffer has by far the simplest, yet powerful UX of any of the social media platforms I've used. The plugin is awesome for quickly loading up content into the queue. It's super fast - click, type, submit, especially when you compare it to the busyness and slugishness of something like Hootsuite. Pricing is great for 1 user - we didn't need anymore seats.
What does Buffer not do well? The only place Buffer shows weakness is in the custom monitoring on a single page. Hootsuite lets you have multiple filters, all in one place, but it's not too big of an issue if you're a smaller company without an overload of social media posts coming through.
What do you wish you had known about Buffer before using? Nothing too substantial - we had done research into the capabilities and pricing of each, and Buffer fit the bill. Hootsuite would have been 10x the price.
Have you used a competitor to Buffer? If so, how does it compare? Hootsuite - far more expensive and too big for our company.