Just bought a pair, same as yours...haven't used them yet but I use Harmony Interchangeable Circulars and LOVE LOVE LOVE them!!!! Previously, when I got into doing lace, I purchased several sets of the cheap circular sets on Ebay...A total waste of money regardless of cheapness....besides the fact that the tube/cord is too thick and you have to struggle to bring stitches around to knit, the points are not very sharp and more than a dozen of the cords have pulled off the needles at the join.....GRRRRR. I am now a Harmony Girl!!!
I'm MWhite on Ravelry, too...add me to your friends