You should know that they are NOT invincible. I once played with a guy who did too many rimshots... busted one of his Ahead sticks after about three months. Believe it or not, this guy didn't really break many wood sticks, though... and he even swore by those Zildjian sticks that break so easily for everyone else.
They are just hollow aluminum rods, after all.
On the topic of wood tips, I'm sort of surprised that Ahead hasn't figured out a way to attach wood tips and shoulders onto their metal rods. It might attract more business if they could figure out how to do it correctly.