Have had mine since late August. Only issue I have is typing. I can't leave gestures on in any keyboard including the LG keyboard. Which while the LG keyboard isn't the worst I've used, I like Gboard the most, with Swiftkey taking second place. But, if gestures/gliding/swyping is on while typing it will occasionally start to try to glide when I'm just using my thumbs. Which is annyoying, and it seems inconsistent. However, I also didn't have this occurring until the october update from T-Mobile, never had it before that. So I've just turned gesture typing off and use my thumbs or voice which honestly I rarely used the glide anyway.
I've had some minor annoyance with the brightness at times. Tried another auto brightness app that you can calibrate but didn't think it was any better. What I did learn is you can set the delay for adjustment in that app, so the screen isn't going to change brightness while you are interacting/touching it. After using that app, I think that's how LG has the auto-brightness setup. I've noticed now if its to bright or low if I just keep my fingers off the screen for a couple seconds, it will adjust. So I've really become quite happy with this, I have not had an issue with it in direct sunlight, its always readable.
Otherwise, no complaints. The technology beast in me craves for the bigger better faster newer thing constantly. I recently had to go to Best Buy and play with a bunch of phones to get it out of my system and it did me a lot of good. Nothing I tried, not the S8, Note 8, the iPhone X, iPhone 8, Moto ZF2, V30, Pixel 2/XL was so far above the G6 in any capacity that it justified another upgrade right now. Not for the price you can get these for. Is the SD 835 chip better on battery and performs a little better? Yep, just a little, not enough for double the price. Is the Note 8 screen incredible looking? Yep, Played a game on it, stunning screen. The V30 is a stunning device, love the look and feel, but it doesn't feel as durable as the G6 and it doesn't sound like the cameras or screen are worth the cost to upgrade. The pixel 2, same size as the G6 but the G6 has way more screen. Those bezels are awful. Pixel 2XL, again, like the V30, stunning device. But with the issues its had and the price, I can't justify it over the G6. Plus, for me the Pixel 2XL is just to big as is the Note 8. The iPhones, X costs to much and I don't like iOS anyway, and I'm not doing the bezels on the iphone 8. There's a part of me that wants the OP 5T but the G6 has better cameras, wireless charging, and I kind of don't trust that companies software right now. A guy at work had an S5 that had a cracked screen for the last year and just got the G6 on my recommendation. Verizon had a $100 gift card and he didn't want the curved screen of the Galaxy phones.
TL DR; for me at this point the G6 at its current price point is just to damn good of a phone. Crazy performance and features for the money. It should get Oreo, has a headphone jack, is water resistant, dust resistant, shock resistant, wireless charging, wide angle lens, the software doesn't get in its way like every galaxy I've had and I get good battery life. In fact standby battery life is phenomenal. You can't go wrong with this phone. Got my silver ice one in a black Spigen TPU case with a tempered screen protector on it.