I'll go ahead and argue that, because I have used this set since Shaymin-S has existed (pretty much). Looking at Shaymins counters (Zap, Skarm, Bliss, Heatran, Registeel, Scizor, Meta, whatever), having the good chance to put them to sleep is invaulable. Sleep is really powerful as you know, but Sleep against something not expecting it is pretty awesome. In fact, I would almost always rather try to put something to sleep (and maybe not succeed) than set up a Sub almost all of the time. Also, Wide lens is just kind of a bonus. It makes Grasswhistle's accuracy 60.5%, which is ever so slightly better than Hypnosis. I would argue that Wide Lens is not for Grasswhistle as much, but for Air Slash and Seed Flare. Together it just rounds off the set pretty well, and it works nicely, I can tell you that.