C.M.
I only went to the Primrose in Plano at Spring Creek/Coit, but preferred Merryhill over it and have been happy with it for a year now. I thought Primrose didn't pay enough attention to the kids (as evidenced in my tour) and didn't like the split room that shared 2 classes - don't know if that's the same in Allen.
We used to be closer to Carpe Diem in Richardson, and LOVED it! Merryhill fit what we needed and I'm happy with my 3 year old daughter's care. My 6 year old (1st grader) loves their summer camp too...