I don't find spares much of an issue. I have loads and you can always pick them up on e-bay. Having said that I have problems finding smaller spur gears.
One thing I have noticed. The car under steers on the power. Getting out of the bends as fast as a B4 is tricky. If you go in slower you get monstered from behind and taken out. Not sure how I can dial it out. I want to be able to get the back out under power without it spinning but I haven't yet found a set-up that will do that for me.
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Me like women....and rc.......and most of the time I look like this......
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