Speaking of Erector sets

Littlejen22

If you have them for a 4 or 5yo, what set do you have and are they able to play with them yet?  Part of me HATES the idea of ever getting more block sets as we already have Duplo which are still played with, Lego, MM&D wooden unit blocks and DD's Haba blocks and recently got rid of a wooden wagon with small wooden blocks and the Mega blocks...but I remember my brother having erector sets when he was in elementary school and I was so jealous b/c I was too young to play with them.