I think those things are really neat but rather pricy.
I saw something really cool! If i could knit and could afford it ($60 something) I would get it. It was an interchangeable needle set. It had a bunch of different guages but the points had a screw on thing so your straight needle could become a set of circular needles. of a different guage. So it was really neat. I don't know if it equaled how much each set of needles would be but it was pretty neat. I hadn't seen the figure 8 ones, just the round ones and a straight long one