The honest verdict: the Iona Medium 13" is the iComfort line's sensible middle: the same cool, zoned memory-foam feel Serta built its name on, in a 13-inch build that fits more bed frames (and more budgets) than the taller models. It's a true medium, about 5 out of 10, so you get the contouring hug without sinking into a hole, while the z...