You called it scarftron again, it threw me off lol :)
But yeah, heatran has 10 resistances and 2 immunities, so can usually switch in with ease. I myself dislike leading with choice users, since it's too early in the game to pull off a reliable prediction as they reach for their counter, meaning you're likely to do very little damage and switch out yourself. Bringing it in mid-game gives you some time to figure out what their heatran counter is and better predict its switch-in.
Not sure, but I will continue to adhere to the forum's rules and not ask for it. Although going by the faq, I seem to tick all the boxes. Meh, I will wait until I am needed =]