Unlimited Internet Data - Any Throttling?

Hello,

I'm currently on a Triple Play 500 Mbps Xfinity plan/1.2 TB usage (which I guess 500 Mbps is obsolate now in lieu of 300, 600, or 1000), and am looking into unlimited data usage for the $30/month, since I'm home a lot more now.  The Terms of Service are pretty vague and confusing for me, and folks I've chatted with seem to just try and sell me something else; but with the unlimited internet data plan, is there any throttling or other controls and limits?

Thank you.