Lenovo zuk z1 is very bad mobile handset.it’s internal graphics is not so good.The front camera of mobolile shows mirror image after taking photo by front camera.Battery backup is very bad.Some simcards have 3G, 4G network problem.the body of mobile is not attractive.Mobile handset will be heated after playing high graphics games and bluerays films and long use of data.it will not water proof.the size of handset is very large and high weight.it will not support good after battry is below 20% .