I absolutely love this device. By no means is it perfect, but what it does well it does amazingly well.
The headphone/DAC is amazing and you can absolutely tell the difference. The screen is 1080p, but I don't notice much of a difference coming from a Note 10+, but that's just my perspective, I'm sure there are some pixel peepers that might notice it. The battery lasts for a long time. I have not had to worry about needing to top up my battery during the day. It easily makes it an entire day with about 30-40% left at the end of the day. This is with average to high usage, generally 4-6 screen on time. Photos come out great, not as saturated as my Note 10+ but still great. Video is also nice.
Also, I received my Dual Screen incredibly quick after I registered for it. The initial email I received said it might take 3-6 weeks. It was at my door in less than a week. The dual screen is fantastic. I love having my music app open while I am browsing my social feeds or messaging. The game pad mode, and landscape keyboard is also great to use. I love the outside of the Dual Screen, give you time, date, and notifications. I think it's great how you get a large icon of whatever app just buzzed your phone so you can see what kind of notification you just got.
The phone with Dual Screen is a little heavy, and a bit bulky, but nothing that is unmanageable. Closest thing I could compare it to is if you ever had an Otterbox on a device, but this is giving you a second screen.
The UI is decent, my only wish is that I could change the swipe down on home screen from giving my a search menu to pulling down the notification shade.
It's a great device, and an easy recommendation for anyone looking to upgrade to a stellar device that has all the bells and whistles.