Daniel, that is a nice slingshot, but there are many differences to the genuine product.
First, the shape of the frame is different. I can't jugde how much difference there is as I do not know the size of your frame, but even at the same size the differences are significant.
Then, the Hunter uses Thera Band Gold bands, with thoroughly optimized dimensions. This is what makes the Hunter so powerful. The hunterbands are not too hard to pull, mainly because of the very good frame design. But they are very effective, the speed and energy of the projectiles is fantastic.