Even with the enclosed extender, the Junior is, indeed, tiny. However, the smallest kids in our preschool setting LOVE having "their own" riding toy; in fact, a little girl with dwarfism spent her entire gym period on the Junior the first day I put it together. I removed the extender in order to fit her and the other tiny ones better, and they prefer it that way. The bigger kids use it as well, but they have to make do--they have other play options if they choose.
It should be noted that the Junior is ARM-powered, unlike the leg-powered big brother, Ezy Roller Ultimate Riding Machine -RED, for example. That was a bit surprising to me, but not a deal-breaker by any means.
By the way, a teacher tried riding the Junior. While the Junior was rediculously too small for her, it didn't bow, squat, or show any sign of stress. The Junior is as tough as the big ones, it seems!