I used to have a ts4n a few years ago , in my personal opinion its an "ok" car to get you started in nitro racing dont expect too many bells and whistles . These cars sell from about 130 pounds new
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so dont go spending silly amounts on a used one .
Spares should be available i know that modelsport can usually get you anything you need .
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Im not sure about a comparison between the tamiya TG10 and the ts4n. the tamiya car is higher spec but more expensive to buy , but i think you would be happy with the TT car, especially as it would be your first.