I missed the OPO as I bought a nexus 5 right before its release. Coming from nexus 5, Only thing I found difficult to manage initially is the size of the phone. I am used to it now. The phone is blazing fast, Absolute beauty to look at, loaded with small features that you would really appreciate and has an amazing build quality.
Samsungs AMOLED display
Qualcomms best processor
6 gigs of RAM
HTC-ish looks and build
Nexus like software
and DASH charge.
You get them all! only missing things are a high quality DAC, shatterproff display and some weatherproofing. But thats too much to expect on this price range