It's simple to set up, use, and get people use it on your team as well.
It syncs very nicely with your email (in my case Gmail) and all of the customer's info is in one single place. Also from other team members who interact with the same account. This is different from other CRMs where all emails are shared by default.
It also aggregates all the files shared via email with a customer in the Account tab. This is awesome, we used to upload files to Asana/Google Drive, etc. Now we can share them via email with the customer and go to salesflare to download the latest version of any document sent by anyone working on the account.
Something also cool is that it supports recurring revenue opportunities and calculates the value of the opp based on frequency, number of units, and price per unit.
So far I'm super happy with it. One thing I sometimes miss is the possibility to send emails from within the system directly. However, I know how hard it is to build an email composer if you want to provide good usability.
We manage our sales pipeline and implementation (post-sale) process too.
Efficiency gains are immense.