I like these holders because you can knit on to them and knit off, if you are so inclined. The best feature, however, is that you can remove stitches from either side without a problem. They have also held together very well, even with a tug here and there from my little ones.
So I only have 1 set of needles the right size, the right connected. With these handy holders, I can slip off the old project and on with the new! When I get new yarn, I just can't wait to knit up a swatch and see how it looks all knit up. These holders save the day!