I cut off my Phenolic tip from McDermott and installed a "Bulletproof" tip. Very cool looking, has a lot of feel, but I've found that I make far fewer balls on the break than I did with the tip that came with the cue. I don't know exactly what my McDermott Sledgehammer came with.
Bulletproof tips spring when hard breaking with a stiff shaft, I tried it for 2 practice and removed it, it's not good for hard breaker, too much lost of energy, I tried a lot and a lot of break tips, I will soon try the hammerhead from Outsville, somme good reviews about that eveywhere.