We were the complete newbies in monetization and we needed all in one solution, so Epom apps worked best for us. We've been working with Epom apps for only 5 months, and there are major benefits that I've noticed so far:
1. They do your app audit and advice on ad placements and formats
2. They handle negotiation process with demand side - they ensure highest CPMs.
3. SDK and ad formats provided are great - we use their in-home ad format smart banner and it pays off.
4. Very friendly managers.
There were no issues yet, but as I remember, they are Android only, so its not an option for IOS developers