TZ was my first pin, I still own it to this day. Learned about the clock board real quick and everything else about fixing and repairing pinball. Was a great first pin, because if you learn how to fix that one, you can fix pretty much all DMD's. Early SS is a whole new ball game and EM's are something totally different. You can't go wrong with TZ. It's pretty much a near flawless pinball machine. Toys, design and rules are fantastic.