Three things that I'd like you to report on.
First, will it play your phone ringtone through your Bluetooth earpiece (especially custom tones)?
Second, when the caller on the other end hangs up or the call is lost, will it play some kind of tone through your Bluetooth headset so you know that the connection is gone?
Third, if possible, can you tell us about data signal, is it any better than earlier models and does it stall?
I'm currently running an S2. American Toy Telephone keeps trying to get me to upgrade, but so far I've resisted, in no small part because I'm way past the contract end date. If the S6 is enough better in those three areas, I will be easier to convince. I currently use my phone as my primary Internet WiFi hub, in a fringe area, and get a lot of stalls when trying to work online.