I was able to set up a Boost link in a few minutes and grab some leads by placing the link in a Facebook post.
I haven't explored all the other advanced features yet. But for my needs, being able to create a Facebook signup link and capture some contacts is enough.
Here's my list of pros and cons:

Pros:
1. Quick and easy integration with Facebook, Google, and other social networks' login
2. Multiple social network login options can be shown to visitors
3. Connects and sends captured contacts to email marketing tools

Cons:
1. UI could be better. Not everything is intuitive. But I was able to figure it out.
2. Many features could be explained better.