Had an Erector set as a child, it was a small one without the motor, think it was a #3 or 4. Few years ago while looking for tools at a garage sale I picked up a 7 1/2 in great condition with good motor etc. Gave it to my grandson, he wasn't interested, rather play games than bolt things together. He grew up, gave it back to me.
I like the Stanlo, had never seen one before you put it on the site.