I was very interested and showed them to my spouse. We have a bunch of drawers and bins filled with mixed screws, nuts, bolts, and similar items that need to be sorted. She was not impressed at all and said she would not use one and did not want to order one. I think she feels that it does not add enough value compared with dumping them on a table and using your hand to scrape them off the edge into a bin. She is usually so neat and organized, so I was surprised. Oh well, I'll play along. Those funnel trays are not for us, but I can't really explain why.
(I could quickly and easily make a flat "drawer" with an open corner if I really think it would help.)