If you enjoyed the LG V20 you will love the V40. The V40 is in a word or two, the V20 on steroids (minus the swappable battery and IR blaster). It sports a faster processor, better cameras that can produce better photos on auto, the headphone jack and the superb QUAD DAC are back for an encore, and the high quality audio/video capabilities are present as well. One feature that is missing that is present on the V20 is the ability to adjust the direction of the microphones. As it is the "glass sandwich" that is the norm of today's glass-backed phones, you will want to put on a case as soon as you unbox it. I have the Spigen Tough Armor which sports a little kickstand for those times I want to view videos hands-free on that gorgeous display and the clear Ringke Fusion when I want to show off the phone''s beautiful body. The battery easily gets me through a work day during which I'm running Google Maps or Waze while I travel the metro area for work, stream I Heart Radio, exchange emails and texts, access my agency website to acquire client information, surf the internet for news and make/receive phone calls. I utilize the Google Assistant voice commands to execute all of the aforementioned tasks as I am a horrible typist and I spend a lot of time on the road. The 5 cameras and video are loaded with special effects that bring out the creative photographer in you and make the device fun to use. The ability to take control in pro/manual mode is still there and the cameras do a good job but are not quite at the level of say the Note 9, which I also own. An option I have added to each of my phones for the past 2 years is downloadable Google Pixel software which helps elevate your photography game to a new level. The various versions (or ports) can be found on the XDA, Reddit, APK Mirror and Celsoazevedo.com websites. You may have to try a number of ports and settings to find one that works well with your particular device.
Well this has been my experience with the LG V40 (I have the T-mobile branded version). It is an expensive device but good deals can be found. I was able to get a new-in-the-box model from Offer UP for $400 USD and with the V50 just right around the corner I'm sure even more discounted models can be had. If you decide to purchase the V40 I hope that you have as much fun as I have.