I tried microg's Lineage image on the OnePlus 3. It was probably the most painless ROM I had ever flashed.
The microg project has been fantastic in providing an open mechanism to interface with Google's services. When I first tried it, I believe they did not yet have a working implementation of all the Google services. Some apps complained about Google services, some did not. You still needed to sign into Google though, which might turn some people away.
For those who want to interface with Google on an open-source ROM, microg's image is probably the way for you.
The microg project has been fantastic in providing an open mechanism to interface with Google's services. When I first tried it, I believe they did not yet have a working implementation of all the Google services. Some apps complained about Google services, some did not. You still needed to sign into Google though, which might turn some people away.
For those who want to interface with Google on an open-source ROM, microg's image is probably the way for you.