Mine is the 4000TI. Have my traditional mask as a back up but hope I never need it. I've had the mask knocked sideways and even off before but not this baby. Make sure to keep your chin down a little more though. HSM's tend to leave the throat a little more exposed, depending on your stance. There's actually a thread on here about that with a lot of good info. Good luck on the 9th. And remember, you're only going to please 50% of the people 50% of the time.