Now now, let's be fair.
The only time a NEW Premium broke was back when they released the Fountain of Youth and that whole compatibility problem with the Spellbook. Since then, new Premiums don't break as often as the older ones do.
And since the Roller Coaster looks to be cloning whatever code they put out with the tractor, the problem probably won't be so much compatibility so much as it may be something related to traits, moodlets, and other unforeseen issues.
Now if the fixer-upper car breaks upon release, then we've got a problem since that's suppose to be just like the fire engine in Ambitions.
