I am currently using an LG G4 that I picked up in October. Coming from a Nexus 4, it felt gigantic at first, but is now basically second nature. I picked up the brown leather back from T-Mobile (brown leather with gold accents) and haven't noticed the issues with the back coming apart pretty quickly. The corners are a little bit darker, but the rest of the backplate looks pretty normal. Coming from the Nexus, the camera still blows me away at how great a camera in a phone can be.
Generally I get a day and a half off the battery by leaving the LG Battery Saver mode on, automatic brightness, and having Androids kick on at 5%. As long as I'm not playing games all day long, moderate use of Facebook messenger, receiving calls and sending text messages has consistently lasted all day. Battery does charge very quickly with the included charger, I think around 90 minutes and I get a full charge. From what I have seen, this isn't even a QuickCharge capable charger. You don't have built in Qi/PMA wireless charging out of the box, but LG sells a backplate with that option (the flip case) and you can also find replacement NFC/Wireless Charging stickers that can go onto your current backplates. I'm intending to buy an extra backplate and one of these stickers so that I can try it.
The only issues I've had with the phone is an occasional problem reactivating bluetooth after turning it off. And unfortunately the IR blaster is rather small, so I've had a few issues with getting it to consistently work with my Xbox One. I also use SmartGlass for these functions, but going this route is faster than trying to connect over the wireless.
I've looked at the V10 in stores, and although I love the concept of having that second screen as a small notification window or having a quick launcher.
If you have any more specific questions, I can try to answer them.