My girls love the Wizard. WHen they first came out neither of their heads seemed to fit in between the wings. Although Britax says my seats have the same head rests as the original Wizards (our DOM is August 29, 2003) I can assure everyone their heads didn't shrink
Both girls have head circumferences at or right above the 95th percentile and love their Wizards. THey are so great for sleeping. My girls are now 4 years and 27 months, and have riden in their Wizards for little more than a year. I haven't put my 2 mnth old in one yet, mostly because she is a peanut, and is using a snug ride. Although we haave two FPSE and a Roundabout I am tempted to get the little one a Wizard when she outgrows the snugride. I had thought I would use one of the other convertibles for her til I was ready to move the oldest into a dedicated booster, then switch the baby to a Wizard. Now I am thinking why should the baby not have a nice soft supportive head rest for slepping too??
My 6 year old nephew is about 53 lbs, 46 inches tall and has a head circumference that is pretty high above the 95th percentile and fits just fine in our Wizards. We have windowpane fabric btw.