our preschooler loves these melissa & doug standard unit blocks. he definitely loves his electronics/battery-operated toys - but he also enjoys dedicating some quiet time towards more imaginative play with these blocks. the blocks are great quality and size - the kind of blocks i recall playing with when i was a child :) easy for our son to manipulate and create structures etc. good variety of shapes and sizes. i like that they're not painted and just natural wood. the melissa & doug brand is definitely our go-to brand for quality wood toys that are safe/non-toxic. definitely appreciate that the blocks come in a wood crate for easy storage - makes putting away the blocks a fun activity as our son enjoys fitting all the blocks back into the crate. this block set is a wonderful investment - every child should have a set of blocks for building! our son will build castles, houses, roads for his little cars to drive on. he'll even pretend a block is a camera or a telephone. we even do counting exercises using the blocks. highly recommend this product - can't go wrong!