Mugen tends to roll with what works. All these companies that keep changing their car designs and putting out new cars 6 months to a year after releasing a new kit means that they did not get it right the first time, in my opinion. They keep you buying/spending making you think that you have to get the latest/greatest just to keep up. I have been racing my MTX4 since it first came out (reluctantly bought it because my MTX3 was still highly competitive but parts availability gave way to the MTX4 parts production, forcing the switch). While I have been running my MTX4, many of my buddies have bought and run both versions of the Serpent 720, several versions of the Kyosho V one RRR, two versions of the G4, and the Xray NT1. Yes, I have one buddy in particular that have owned all the above including the MTX4 during my almost 2 years of owning my MTX4. So, why keep making major changes to a product that is working just to make changes (ask the folks that bought the Impulse Pro which was quickly replaced by the 705 and immediately replaced by the 710, all of which shared almost no parts meaning you were stuck like chuck especially with the 705 model). So, Mugen, take your time and if you are eventually going to come out with a new model, phase it in like you have done with your previous two models (MTX3 and MTX4).