The bent shape works with the natural contour of your eye to deliver a smooth, straight line everytime.
And yes, this brush is ALL that and a bag of potato chips. I LOVE it. It took about three tries before I could get the hang of it but now I get the bet lines I've ever done. I don't even look at an angled brush to apply eye-liner. And I own a few.
The bent tip allows for more control and it also allows for you to see exactly what your doing.
For me, this brush is a MUST HAVE. I highly recommend it. I did notice that E.L.F has a bent eye-liner brush that is about half the price of the Kashuk one but I haven't tried it.