Trackside spares supply will not be as good as a B4 for example but that is only because the B4 is so widely spread. Even if you're on you're own for spares you could get a second kit and not have to worry about spares for a while.
A B4 is also not bad because people know them in and out now so you have plenty of help on hand for setups and troubleshooting but that really shouldn't put you off the rat.
I'f you have it on the way I say run it and take it from there. Don't let yourself be put off before you've had it on the track for at least 2 races.
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