One thing I will add with the comments about being springy and subject to break. They did have some issues early last year with breaking hooks in size #4, but that has pretty much dried up as far as I can tell. When the bad ones were around they were all bronze and I even broke quite a few just tying them. Never really had any trouble with any others.

One other thing if you are worried about them breaking and not bending, try the #6 and don't ask me why as I have not clue, but the #6 seems to have a lot of give to it and will bend much easier than a #4 IMHO. SO if you get hung up and use heavy enough line you should be able to pull it loose and bend it back.