Went ahead and installed Oreo on my G5Plus.
Literally impressed, this being a first version and everything. Ended up installing all the applications I usually have on my phone - including root access. Everything went smooth and I didn't encounter any problems. Basically I will use it as a daily driver.
What doesn't work:
* FM Radio App
* Proximity sensor during calls - screen doesn't turn off by itself
Annoyances - unrelated to development, but more overall Oreo experience:
* not that easy to remove navbar
* all the settings are rearranged so, it's hard to find anything at first
* data usage option - hard to discern between the two SIMs
Don't know yet how battery life is - will get back to you guys.