They are certainly the best I have seen so far by a very long way, in fact the only release clip where the bait is actually held in position.

I have taken note of the valid issue RP has pointed out but I this could be easily cured with a secondary nylon loop. Should the sinker get into a position where it could unclip itself at the time of the cast, then the loop would act as back up. Failing that it may be possible to squeeze the end of the swivel that attaches to the clip with pliers, thereby crushing it to prevent that situation arising.