Guillotine-type head for turkey?

You guys that have hunted turkey know that they can be tough. I’ve killed several, but had some get away too. I’ve been considering using a Guillotine-type broadhead, and shoot for the neck. Any of you used them? What kind of results?

Remember now... the questions are,"Any of you used them? What kind of results?"
Anecdotal negatives and positives are okay too.  I'm looking for real world experiences, not notions.

Oops!  Sorry.  Tried to edit and ended up with double post.

[achigan]

There are 4 pages of comments down page under "Ethical turkey setup"

Originally posted by achigan:
There are 4 pages of comments down page under "Ethical turkey setup"

I've read that one and all I could find in the search, which is precisely why I started this one.  I'm hoping to get "more experience" and less comments (notions).