The duckbill clips that I have are about 3" long and curved slightly; the Deva clips are about 1 1/2" long and straight. I tend to use the Deva ones more because you can put them in more random areas due to the fact that they are small. hth.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.