This is my second Cuisinart Popcorn maker.  My previous one lasted 10 years or more.  In fact it still works but I broke off one of the clips that holds the middle to the bottom.  The new popcorn maker has a smooth rounded top clear part.  This is much easier to clean that the last version.  The  stirrer moves the kernels around and reverses direction to be sure no kernels are left on an edge.  Virtually every kernel pops!  The old Cuisinart popcorn maker was great and the new one, even better!