Well my "Flagship" Phone I have to use a form of Bluetooth for people to hear me on. I've got my gripes with Microsoft, The app Gap but at the same time, I have an iPad Mini (Don't throw Gauntlets at me), and a laptop, really I use my phone for quick checks on facebook, Instagram, and occasinally e-mail reading. I do use it for GPS and Calendaring. Ive been comparing it to the iPhone 6 Plus and obviously what I currenlty have and I keep telling myself if that .5 .7 inch diference that huge? Ive been watching Videos reading posts in this thread etc. Really the only thing I ahven't done is put one of these in my hand to see the responsiveness.
Im not sure why the 650 would be a downgrade it seems more like a laterral <sp> move to me like they didn't really change the name much.
I will say I wish the 640/650 had a Biometric Fingerprint reader on it or facial recognition but my 1520 dosn't have it either so Im not missing a huge amount there.