Ok, I understand how they work, etc.

But what are the tradeoffs for getting a mild cam?

I know it can reduce KR and allow you to run a smaller pulley for instance. Seems like an excellent mod aside from the cost. But, seems like every mod has some form of trade off.

What is the trade off with a cam? Does it make your engine run rougher or idle louder? More strain on the tranny? More strain on other internals?

I'm new to the thought of swapping cams. I'd just like more info.