Internal Audit

I'm an audit senior with a top 10 firm, and I'm looking to move into the private world. I've settled on the decision that public accounting is not for me long-term. While I mostly enjoy the accounting/auditing work, the hours, stress of constant deadlines, and pissed off clients (which appears never ending based on my experience) is too much to do for the rest of my career. Ultimately, the goal is a controller-type position with a large company. I am interviewing for a Senior Internal Audit position with an F100. What are your experiences with internal audit? Will I be bored out of my mind? I'm afraid to pigeon-hole myself there, or waste time not progressing to the (blurry) end goal. Your thoughts/experiences would be appreciated.