You are going to hear only good things about the slick tricks. I just posted a forum about the damage they did to a ground hog at about 15 yards. they fly great and I have not had an incident with them pushing in on the insert, but I have not shoot them at anything hard.
Are you think that if you hit a deer shoulder that this might push it into the insert?

http://www.huntingnet.com//forum/tm.aspx?m=2230307