A minor word of caution. An R22 was badly damaged ( albeit with no injuries ) when it was oversped to the point the tailboom fell off - literally. The student pilot had an ANR headset on, and was concentrating so hard on one aspect of the flying he forgot to monitor RPM. it's possible he'd have heard it if he'd not had the headset on.
This isn't to say ANR is bad - just, as with all things in flying - be aware of its limitations.