Let’s get one thing straight: I take my glow seriously . After more than five years as a beauty writer and product tester, I’ve tried just about every gadget, serum and LED contraption promising to deliver “glass skin.” My bathroom has, at various points, looked like a cross between a spa and a sci-fi movie set. I’ve been steamed, zapped, suctioned and exfoliated in the name of journalism (and I regret none of it). So when Shark (yes, the same brand known for vacuuming your floors) decided to