I have recently returned to the hobby after 15 plus years being away. Can you guys please explain to me the differences in performance between HO cars? I have sets that came with the SG+ cars. I used to have magnatraction and T-Jets many years back. How do all the different cars stack up against each other as far as speed is concerned? It would put a lot of things into perspective for me when reading a lot of things you guys are posting.