Hello, my name is Justin from Texas. I loved Legos growing up and am now starting to share the experience with my kids. Right now we are still using Duplo's. I was reluctant to get them at first until I found out how fun the trains are. We have wooden trains, but the Duplo set seems to be better with 2 toddlers who usually destroy everything.
Also, as a mathematician I became extremely interested in solving the All Points Reachable/Visited problems. I obsess over my tracks well after the kids move onto another toy.