TRF: The only real problems I have heard of with the car is the one-way diff.
But, as I said in another thread, thats every company. I have yet to hear of any company that has a one-way front diff that hasn't failed. Thats why I wont use them. Those things cost too much and break too often.
Once Kyosho sures up that one-way diff or people switch to a normal front diff, the KXone seems very durable.