I've used them successfully to takeat leasta dozen deer over the last 4 years, and will say they are a good broadhead. That being said, I'm switching this year back to a fixed head. The main reason is I have noticed on 4 or 5 deer that have been shot with spitfire's (not all mine), all on less than perfect shots, that when the broadhead either remains inside, or slides back out the entrance hole because the blades close when backing out less than 2" there is no additional cutting or damage done. This has lead to longer bloodtrails in my opinion.

I used them originally because they flew so well out of my set-up, dead nuts on with field points and I had not had exact performance like that from a fixed. With some of the latest fixed, I get that as well so the main reason I choose them is moot. Take away the very small flaw of blades not slicing any additonal flesh on exiting the entrance hole and I'll switch back to fixed. Their main advantage now over fixed is they are safer to carry and less likely to cut something (like my finger) while hunting, but I'll take the strength and cutting power of a fixed over a mech now.

Very good heads, that really do a number on deer when they hit right.