They are worth every penny. I got into Z's about 2 yrs a go , and I'm still mad about them. They are the creme de la creme of 1/28 scale racing. Go for it, here is a list of readysets available at mini-zracer.com
http://www.minizracer.com/shop/products.php?pid=8
Alternatively , Draconious sells readysets:
http://www.draconious.com/Mini-Z/P_ProductList.html
Trust me, you
won't be disappointed! You might be addicted, but you won't be disappointed!