I have them and enjoy using them for some projects. I have used them for magic loop and they are not the best for that. For other projects they are fine. One advantage to them is that they are easier on your hands.
My favorite for lace and magic loop are the Chiao Goo needles I bought here.
The needles are nice and sharp, the joins are sturdy and the cable is supple. They were recommended in a Ravelry lace group I belong to.
Note-I just noticed they have an interchangeable set for sale and I have not tried those. I've tried the individual needles.