Ok had my Zuk Z2 for a week now so here's my little review (coming from a HTC M7 which I had for 3+ years)
The phone cost me around £130 with discount and percentage off going through topcashback
Installed official Indian Rom which updated to latest version OTA (vpn)
Positives:
Great design. Looks much better in real life than pics or video
Top notch screen. Better than my M7
Google launcher is blazingly fast
Battery easily lasts a whole day. Standby from 7 am then checked 1 pm and only 5% drain.
Call quality is great.
Audio sound quality through headphones is really good
Video playback quality is great
4k video recording outside in good light is very good. Pretty impressed.
Negatives:
Slippery as hell. Put it on my desk thinking it was a flat surface and I could literally see it moving away from me slowly. Will need a good case.
Camera is not so great in low light situations. In good light outside its very good.
Sound quality through the built in speaker is average
Sound qulaity through youtube is off even if using headphones. Cant put my finger on it but if I listen to a song on youtube its as if songs are missing some instruments. The built in music player does not have this issue. maybe a youtube app issue. Not sure.
Overall very pleased with the phone. Its a huge upgrade from my M7. For £130 you cant really complain.