Why are karbon phones so cheap and nice?

Karbon is an uprising company which has completely surprised all of us the phone is having amazing features and the price of the phone is still low and anybody can buy these phones. But the real question arise is why these phones are so cheap and well featured as well but how they make these phones so cheap and other companies like Samsung and HTC make phones which are very expensive and good featured. Phones of karbon company doesn't get damaged so quick as well and these phones doesn't hang as well so I want to know that buying a phone of karbon company is safe enough or not or I should go for some other company like Samsung and HTC.