I've been tying the 1/24 and like using it. I find it - the collarless - the fall about the same as a 1/32 with a collar. I have a friend that wouldn't use anything but a 1/48 collar. I poured some 1/24 for him and told him they were in between a 1/48 and 1/32. He loves them.
I never used the 100's.
I had this conversation with Skip a couple months ago and it seems like all the collarless jigs weigh about the the next smallest size with a collar. Just our thoughts