Has anyone used rocket broadheads?

[JB Florida]

I'm getting ready for archery elk next fall and Ive been trying out different heads.
I have used thunderheads for a while but I just wacked a doe with a rocket and it was IMPRESSIVE! They are good on deer I'm sure but how about ELK?

 

[ELKCHSR]

John, look in the bow section, Greenhorn posted a good post on them...