3 Advantages:
1. the size of this technique is a good Advantage, being able to grap an opponent and if it can grab it can squeeze to death also immobilizing the opponent while active.
2. Because of its size again it can cause a reasonable sized destruction with a swip of the claws. In other words sometimes you don't have to aim at the opponent but for the surroundings.
3. It can also serve as a defense, using the demonc claw which is like a giant hand to cover your whole body with it directly infront of you, just like how sasuke's incomplet susanoo defends him.
3 disadvantages
1. Since this jutsu travels from The users hand it means its still attacked to the user, so a fire jutsu on it, would build up due to the wind of the claw and go straight at the user of the technique.
2. Even though it requires no hand seal, I believe it would take some time to prepare, being as the accumulation of wind and shape manipulation, even a person without dojutsu would be able to see this technique while its being created.
3.
how would you defend against it.
I would use a fire wall, Or a water pillar thrust/water dragon hitting exploxion, which will first make a water pillar thrust, thus throwing my opponent in the air and making him loose concentration either as he makes the jutsu or after he makes the jutsu, cause once thrown up he is unbalanced and can't do anything until his balance is regained.
how would you perform it.
Kefa starts to build his wind chakra, channeling it it to his right hand(his dominant hand) using shape manipulation on the wind chakra he channels there, to make it more dense or compact as he then uses the shape manipulation further by making the wind circle his right hand, kefa then released it allowing the wind chakra to mix up with the surrounding air thus making it infused, and finally with the use of shape manipulation again kefa molds all the infused surrounding air into a big claw called the giant claw.