First time I heard it was about 10 years ago in Chilton Co. I was bowhunting and had two fawns on a greenfield, heard a deer running in from a thicket, a nice buck popped out and immediately postured at the two fawns. He snort-wheezed them and they flagged off the field.
A few years after that I watched a small spike chase a doe on Choccolocco WMA...he snort-wheezed at her multiple times, and buck roared multiple times. It's crazy how loud deer are when they roar.
In the past two or three years, I have seen multiple bucks of different sizes on Pelham Range (military base in Calhoun Co) both snort-wheezing and buck roaring. I watched a 4pt stand over a bedded doe this year and snort-wheeze, then paw at the doe to stand up.
Now, the one thing I have heard, but never seen, is two bucks seriously fighting. I've seen them lightly sparring in early season (usually while bowhunting), but never seen two large bucks get it on like they wanted to kill each other.