I have this in my toddler classroom. My 2.5+ kids love it!! The younger ones have a harder time because the shape is difficult and the movement of the puzzle. It is a great work to have on the shelf to challenge all my students.
Exploring Montessori Language Work from Ages 2 to 3
According to Maria Montessori children are in the sensitive period for language from birth until age 6. Here is some toddler work to take advantage of that time, and hint it doesn't include the alphabet!