it took a few years to come up with a TC4 after the TC3. it's been 4 or 5 years and there's no NTC4 yet to follow the NTC3. heck, the RC10GT is more than a decade old and there's no GT2 or whatever yet.... so i guess, the TC4 will be around for a while. nice thing about it is that you feel like you have the latest car still not like other companies where the car is only "new" for a year, sometimes even less (i.e. 6-8 months for Kyosho SP1 to SP2)