I've used them since I started hunting (6 years ago). Every once in a while I think about changing, but then I remind myself, if it ain't broke, don't fix it.

They seem to be constant from broadhead to broadhead and rather tough too. This past year I was able to tune them with my bow to shoot <5" 5 shot groups at 40 yds.

I really like them and will probably stick with them for a long time.