I have the Stumtiger only problem i had with it is the airsoft motor broke because they use a cheap one with only copper tabs that hit the com and they wore out quick so i replaced it with one of the HL ones that use brushes....Other than that my Stumtiger works fine other than a lack of power for turning out doors...but i feel that is caused by the AA pack it uses the new KT uses 7.2 regular sub C cell packs they will supply the motors with more amprage if they need it as the AA's won't so the KT may be nice now with more power.