I have the 6+ and the Edge. The edge was never going to replace my 6+ as I want an iOS device and android.
However my M9 will arrive tomorrow and I will be deciding on whether I keep the edge after I've used the M9 daily for a week. The edge is a delight aesthetically, but once passed aesthetics the experience of the software has been disappointing.
Ram management and app refreshes are annoying me more so than on any Samsung device before it. Can't leave an app and answer a call, send a text, go back to the app and it's forced to refresh. Seriously side by side with my 6+, the 6+ is out gunning it background app performance wise with less refreshing. Which is insane in a 1gb device to a 3gb device.
I've not been able to get the battery life others have. Indeed I'm getting worse battery& SOT than the original Moto X 2013.
The phone has choked a few times under load (applying a theme will grind the device to much of a halt).
And as for using exynos because of heat compared to Snapdragon, well my Edge gets very noticeably warm at times.
The camera is awesome, the phone looks and feels great - but the software experience whilst in many ways is improved - in others has ruined the joy of using the handset.