Quite happy with Sailfish
I run Sailfish on my second phone, for purely business purposes. It's a Sony Experia XA2 dual Sim and it works a charm. My main phone runs iOS and for my second phone I wanted something different. I'm staying as far away from Google as possible (especially for business) so an Android phone was out of the question. For the same reason I don't run the Android layer on Sailfish, although that seems to work pretty well judging from other people's responses.
For a daily driver for business purposes I'd say it runs pretty well. Email, contact and calendar sync with Exchange works well, fingerprint recognition and camera work well. I was skeptical about the dual SIM but that works fine too. The browser is a bit sluggish but it sounds as if that is improved with this update.
If you want/need a second phone and want to escape the iOS/Android duopoly I can recommend Sailfish.