Lumia 950 is the first device with Windows 10 Mobile. The 5.2 inch 2K display with 564ppi is awesome. Its powered by Snapdragon 808 chipset and comes with 3GB Ram.
The 20MP rear camera with Triple LED Natural Flash is superb. It weighs only 150gms and very comfortable for One hand usage. Windows Hello works well. Continuum is great!