They are a good bit smaller than her unit blocks, but we still mix the sets together to make really big castles! Playing with blocks is one of O's all time favorite activities :)
The storage case that the blocks arrived in was cracked, so I called Guidecraft and asked them to send a replacement. Their customer service is fantastic. They were VERY nice and immediately sent out a replacement storage container. I like to buy Guidecraft items since I know I can count on them to replace any missing or defective parts. O's Kitchen Helper is also made by Guidecraft, and they were wonderful about sending 2 replacement Kitchen Helpers when the only thing missing were the screws. I'm still shocked by that!