These are serious heavy duty transmissions. Scale speeds for all tanks will be correct. Spare parts will be available. If you are going to run the occasional weekend then go with the Hobbyraw systems. If you are going to do serious running and IR battling then these will fill the bill. I do not know how long it will be before I have Taigen lower hulls to adapt the system to. First runs will be for Tamiya and Hooben. This transmission system can be added at any time during the build or after, so reality is there is no rush for you to choose at this moment.