i use the tekan 11 because i think its the closit to a fix head that flies well with my carbon arrows !!!!!! ive shot a buck last year in the spine and it did a great job on a not so great shot!!!!!!!!then this year i got a doe and got her though the bottom of the lungs and the heart great blood trail.!!!!!but i think next year i mite switch back to my alliumom arrows that shoot fixed heads great!!!!!!!!!