It requires numerous kernel patches to work, more patches for older kernels ie. 3.4 kernel of which we haven't managed to get it booting on, yet. The only device so far that has got Anbox booting is the Jolla C.

As for the image itself running on Sailfish, the issues are no input, no keyboard, and no navigation bar.

My next phone will most likely be the XZ1, when that comes out my Nexus 5 will be free to freely test and work on Anbox. Not yet sure which to do first, hybris-ify Android Oreo in order to get Sailfish on the XZ1 or Anbox on Sailfish, probably the latter, as I know more about the inner workings of Android (I have a potential fix for the latter two anbox image issues) than I do about hybris.