Just flashed to Euro ROM today. Feels better and Face ID added. Now let's see if the battery is improve.

7.12.7 Beta
If you choose Stable one, it doesn't have Face ID.

You can research about it, there are handful of differences between these two.
Global stable/beta still don't have Face ID, right?

Definitely worth it with it's 6.44" screen. A replacement for lovely Xperia Z Ultra with the same screen aspect ratio.

More worth it if you flash it to other ROM. So you can get the most of its bigger screen.
Like:

• 5 toggles in notification area (4 toggles in default)
• smaller bar notification, can fit more app notification without a need for scroll (default maybe less than 7 that fit the screen)
• Face ID (not available in default)
• Change to smaller than XS text size (default can't even change DPI even from Developer Options)
• Split screen (this i'm not sure if global already have it)

1 day I got the phone already request Xiaomi for unlock code.
3 days later (yesterday) already flashed to Euro ROM.
I've been using the Euro ROM since Mi Mix 2, used for 2 months and really happy with weekly updates.

So conclusion, will keep using this phone until there is new worthy contender with 6.44" screen.

I don't gaming in phone, sorry.

If you prefer official one then go for international/global ROM provide by Xiaomi itself. Less feature but hey it's official.
If you want more features, speed, etc; go for other than official. I'm currently using EU ROM. Weekly updates but I only update it once every 2 weeks as it a hassle to reflash the root access.

Seems so. Need a smaller phone with bigger screen.