For me, it wasn't worth it on my last pair. This was at Wal-mart's Vision Center, btw. Paid $30 each for anti-glare and anti-scratch and both treatments didn't do anything better than the el-cheapo lenses I usually get. I am, almost as a rule, very hard on glasses as I tend to traipse around in the woods a lot along with rough-housing with friends, neighbors, law enforcem....ahem.
Anywho, if you're not the kinda person who freaks out over a micro-scratch on the very bottom of your lense, then don't bother. Otherwise, I dunno, maybe it's for you.