I bought my Letv LeEco 1s last year its a nice phone the looks , dedign is nice & beautiful covered with metallic design & does have fingerprint scanner.
but here are some cons of this device 1.Heating issue ( hot as iron)
2.No memory card supported so you have to manage with inbuilt 32gb out of it you will get , around 24gb usable.
3.Camera is very bad, colour production is average.
4.Battery drain fast but pros point is it support fast charging.
5.Does not support VOLTe ( if u want you have to set it manually) by flashing zip.
5.System updates - no system updates till now
And user interface is not good I dont like tge UI but you can install other alternative from playstore