The auto is highly unreliable with a stock motor. If they are using an a543 transmission (??) Then the internals will be much stronger and can even be swapped out for stronger ones, 700hp w/ turbo internals.
Just because you have a manual...doesn't mean it won't break. They break just like the auto's do. I'm not saying that the manual isn't a better option, but they aren't the greatest either.
If you need a good transmission rebuild, let me know.