By far the best zui rom for z1. Gapps work great (installed from the chinese appstore), battery is quite good with about 6h SOT, GPS works fine. No crashes whatsoever.
I've been on every zui i could get my hands on, from 1.0 to 2.5. Nougat roms especially are shit with gapps.
I'll stick to this one for a long time.