Short of the OPO, this misses the real elephant in the room, China phones and their emerging dominance worldwide(if not in the US just yet due to some bands not being addressed...yet.).
I've been getting and doing many,many reviews on phones that make even the flagship phones look like your wasting your money. Some China companies, like Xiaomi and lesser known ones, are putting out some seriously powerful phones that are just as good as much of whats coming out today from the mainstream companies. Just saying at this point that you can't say"it's a China phone so it must be junk" anymore, the quality is vastly better than even a year ago--China learns fast and improves even faster. And that's the real reason to be looking at whats offered over there, some phones are truly stunning for very little cash.
If your not rich, have a big family or just need a phone that does 98% of what a flagship can do for less than $200.00US(sometimes a lot less!), than this is the real way to go. Resale doesn't come into the picture if all you've spent is that amount. And the best part is that the phone is already paid off, can work across many different carriers(so your not stuck with just the one you bought it from), and it's a great feeling knowing you got a great deal on a powerful phone.
Here's an example of what's available right now, look up the specs(here's one: Antutu score of 41000, no joke!!) after seeing this video and see for yourself what your missing out on!
MLais M52: https://www.youtube.com/watch?v=OSOjYh7XtXU