Not exactly what I'd hoped for, but pretty good
I had the same hard plastic octopus clips for years, but eventually the teeth broke.  The ones I'd bought more recently felt flimsy and seemed to have less grip.  I thought I would try these instead-- they seemed large (they are) and durable (they seem to be).  I would say they are a cut above the drugstore standard type clip and a much better value,  but I'm not thrilled with them.  I purchased them because I wear my long hair (mid-back length) in a bun a lot of the time.  The teeth on these don't seem to have as deep a grip as I had hoped for.  They can be tricky to get into my hair securely and occasionally they fail to hold my hair.  I will add that I think part of the issue is my technique, which is why I'm giving four stars rather than three.  I find that after a couple of tries, I'm able to get a better hold, and I think I may get the hang of using these more effectively as time goes on.  For the price, I think they are a good option, but I do wish the teeth had more grab. UPDATE:  As I have continued to use these, I am less impressed.  They have slipped out of my hair several times; they just don't hold it well.  I don't have much confidence in them.  Reduced to three stars.
Rating: 3 stars