I tried some 3 1/2 years ago when they where Excel (not ST)and yes they where accurate and yes I killed with them. However, half of them developed cracks within 3 months. I didn't feel they held up very long at all. I switched over to the Epic ST and I am still using some of them 3 years later ( a lot of shooting).
Odd thing is, I still have one good Excel that refuses to give up and is one of my crow/coon/pest/small game arrows.
The epics where just a bit more than the Excel's and a bit cheaper than the Axis.