I'm still using a Note 3, I looked at the Note 4 Edge pretty seriously, but decided against it, mainly due to the fact that the Note 4 Edge screen is actually overall a tad smaller than the Note 3, and by the time you account for the side bezel, the "main" part of the screen, facing forward, is quite a bit smaller than the Note 3. Now, the Edge is a higher resolution screen, but I didn't want to go to a smaller screen at all.
From the official Samsung specs:
Note 3 = 5.7" 1080x1920
Note 4 = 5.7" 1440x2560
Note 4E = 5.6" 1600x2560
I can't quite fathom why the Note 4E is actually smaller than the other two, unless for some reason the screen measurement doesn't account for the side bezel at all? But the resolution definitely does, so I wouldn't think they wouldn't count the edge into the measurement.
All things considered, if the 4 Edge were the same price as the 4 I might consider it, but I'm definitely not paying $100 more for less screen size than the 4. I think the standard 4 would still be the better upgrade choice coming from a 3, but at this point I'm going to hold out and see what the Note 5 looks like, it's only 4-5 months away from an announcement
Also, FWIW, the Note Edge uses Gorilla Glass 3, same as the Note 3, but the Note 4 uses Gorilla Glass 4. Its almost like the Note Edge is a phone that is in-between the 3 and 4, technology-wise, rather than an upgrade from the 4. I think the Note 4 is the current best *large* Android phone available.