Bought it a week ago...
I've bought the Reno2 some 8 days ago to replace my aging OnePlus 3T.
So far I'm very happy with it. It's posh, snappy and generally a pleasure to use.
It supports the latest iteration of VOOC (what OnePlus used to call Dash Charge). AFAICT the chargers are totally interchangeable between the phones, though Oppo's (newer) charger promises 20W of oomph instead of just 15W.
It also came with a screen protector pre-applied, which is a very good thing, and a really ugly case which I'm not using.
The selfie camera (I've heard it called 'shark fin' but will henceforth refer to it as 'pizza slice') works very well so far. I don't use it often though so don't mind the slight delay. The mechanism seems sturdy enough.
The pizza slice also looks much nicer than OnePlus's rectangular periscope thingy.
* The camera is very good (though I might be biased as the 3T's camera is not much to write home about). I'm very impressed by its night mode.
* The on-screen fingerprint reader works very well and looks good, too.
* ColorOS is generally a nice thing. Coming from OnePlus's OxygenOS (which I love) it's not all that different. The notifications are a bit too iPhone-y for my tastes... and dragging a finger down on the start screen will bring up a search window instead of pulling down the notification area. The latter would be lovely for one-handed use on such a big screen.
* Built-in privacy tools. You can set data-grabbing apps to see an empty phonebook, an empty calendar etc. Unfortunately this does not work with system apps.
* Autostart can be disabled on a per-app basis.
* Secure environment for banking apps. Not sure how secure it really is, but at least the phone tells you that the app gets some extra protection.
* Protected apps that require an extra PIN (or fingerprint) to access. You can also hide the app icon, so that the app is only available by dialling a user-configurable phone number. I'm using this for my banking apps and the bloatware that can't be uninstalled, see below.
* The battery lasts forever.
* There is some bloatware. Most can be uninstalled, though a couple apps remain.
* Most Google apps, especially Chrome and Maps, can neither be uninstalled nor disabled. I hate both. With the Reno2's very good privacy helpers, this would be the one reason for me to root the phone. Workaround: remove all app permissions, make them 'protected apps' (see above) and hide the icons.
* There's an app Called Phone Manager which is supposed to keep your phone in good shape. While this is a good idea in theory, in its current iteration it does this by repeatedly asking you to disable all background app and asking you to delete basically everything on the phone, including data you're still actively using. It also won't take no for an answer and keep bugging you on a daily basis. I ended up disabling the notifications altogether.