I agree with everything so far, so ditto the above posters plus these extras
Pros
-Rear curtain sync flash (manual mode only)
-RAW save mode for camera in manual mode
-Excellent video and sound recording quality
-On screen home buttons (subjective opinion)
-Customizable home buttons
-Qslide floating apps
-solid feel
-SD card slot
-I'm told I sound great on speakerphone (yes, someone actually wanted to know what phone I had when I let him know I had him on speaker)
-Quick finger print scanner response
-Power button on the back (subjective opinion)
Cons
-Very slippery body
-Can be too big for some and one handed use can be tricky
-No OEM calculator for Qslide
-Very aggressive noise reduction in the camera on auto mode.
-Very aggressive throttling of charging rates. It's QC3.0 compatible, but you only get full speed charging with the screen off and the phone cool
-Steady Record 2.0 for video seems buggy and may be best left off
-Volume buttons were returned to the side (subjective opinion)
-Limited OEM UI themes (third party themes are coming out in Google Play, though)
Things to watch out for (may or may not be a con depending on the user)
-Gaming battery saver may be on by default, hurting gaming performance. This can be disabled in the battery settings, but is not really advertised.
-Sprint removed the OEM music app
-Verizon and the unlocked version do not have FM tuners (not sure if any other variants are missing this)
-You can find and side load earlier LG OEM calculator apps to get it functional in Qslide if you really want that.
-Using manual camera mode and working with the RAW files in third party apps gets around the noise reduction problem, but may be more work than some would like.
Final word:
It's a niche phone for people that want lots of functionality for content creation, as well as performing well at most every other task. The biggest down side is the image quality in the camera auto mode. If that's your main concern, then I wouldn't suggest it. Otherwise, nothing else current on the market touches it from a functionality standpoint.