Right now, my main issue with it is instability, since things are still being actively developed. I've had a few crashes here and there, and sometimes you do get annoying bugs. There's also app support, you can do most things (and indeed, there's a lot of weird niche apps too) but there's some that are curiously missing (thougu you can get away with web apps or Waydroid for most of them, on my device I never used Waydroid!)

Everything else is okay at best, the cameras are fun to shoot with, but won't be what you want to capture your important memories.

GPS via WiFi does work but puts me in a nearby city (making it useless for navigation). Note I didn't use it much with a SIM card, so maybe GPS works better with that. Mobile data does work, 4G LTE and all.

Cameras do work but early stages right now, here are some sample images:

very bright conditions (very sunny, direct lights)

very dark conditions (nighttime)

ideal conditions (in the shade)

I personally think the cameras are objectively not great, but they do work and some of the images look pretty cool and almost film-like with glare, graininess, colour shift, etc. It's different from modern smartphones where every photo is automagically good through lots of algorithms, while with this guy you need to find good lighting and such