Donny, the Crown CM-311A is the most popular headset mic in the world. Not just Garth Brooks, but a huge number of other vocalist exclusively use this mic. As I have said many times in the past, some folks have the ability to utilize vocal control and some folks do not. Most of the do nots, which includes a number of top vocalist, do NOT perform using an instrument. They usually have an entire orchestra or band behind them - all they do is sing. They do not play the guitar, organ, arranger keyboard, drums, etc...
I learned vocal control many, many years ago when I was a news caster for a Baltimore radio station. We wore a headset mic and were able to phrase our voice in such a manner to place emphasis on certain parts of a sentence that made the stories we broadcasted interesting - just the same as phrasing does for most songs. Without this type of phrasing the songs would fall flat on their face. Power singers do this by pulling the mic away, thus creating a proximity effect to place emphasis on certain words or phrases within a song. Not everyone needs to do this, and professional broadcasters, newscasters, and those doing voice overs for commercials do not use the proximity effect. I have made dozens of commercials, some for major auto dealerships in the Baltimore metro area, and used a headset mic for every one of them. I was paid very, very well to do this because I had, what many considered, excellent vocal control.
Unlike many folks on this forum, I actually took a course on improving my vocals and broadcasting skills at the local community college called "Voice And Articulation." It was a 16 week course, 3 nights a week with a gal named Marry Anne Pastilak, who was a great jazz singer in the Baltimore metro area. She taught me a lot, and I was aptly rewarded, both financially and mentally. Not only did I learn breath control, I also learned how to be a better newscaster, a sportscaster and be very comfortable using a headset mic. She quickly noticed that I needed help on my phrasing and diction. Most non-pro singers never think about diction, but it is probably one of the most important aspects of singing. How many entertainers have you heard that slur their words? Lots, I suspect. I never really thought about it until she pointed it out to me. While Carol and I were in Memphis I talked with a lady that taught diction to many of the greats, including Elvis, Strisand, and a host of country singers. She had a 2 year waiting list to get into her course. Many of her students used headset mics and played guitar - not handhelds.
Now, there are lots of folks on this forum, and others, that call themselves power singers. Essentially, they sing loudly into the mic, pulling the mic away or backing away from the mic, especially when they try to reach those high notes that are often nearly out of their vocal range. Nothing unusual - I've seen this hundreds of times. However, that same person does not have the vocal control to use a headset mic. Don Mason tried it, you have tried it, and many others have as well, and all met with marginal success at best. Nothing wrong with that. Not everyone has the ability to control their vocals in this manner. It does not make them more, or less, professional.
From my perspective, professionalism in music is far more than the type of mic that someone uses. In fact, that's the least common denominator. Not only does a pro entertainer have to have the ability to sing and perform on stage, they, IMO, must provide their audiences with the correct emotional appearance, dress for the occasion, have the ability to read the audience, have the ability to communicate with audiences of all ages and backgrounds, both from a vocal performance, and an entertainment perspective. All of these things are far more important than whether he or she stands in front of a mic, holds it in his or her hand, or wears it on their head. As for the mic blocking the face, a large headset mic is about the size of a .50 cent piece, while most handhelds are about the size of an ice cream cone with a double scoop. NO CONTEST!
Now, when I saw both you and UD on stage in New Jersey and Philadelphia, you both had that handheld mic touching your lips, completely blocking the entire bottom of your face. Your videos of yourself show this as well. You can readily see how much the headset mic blocks my face and Garth Brooks face. There is no comparison. In Larry's video, the same is true. Very little of his face is blocked by the mic, thus his facial expressions are clearly communicated to the audiences.
Not everyone is comfortable wearing a headset mic. You, Don Mason, and many others on this forum are clearly in that category. This doesn't make you wrong, or me wrong. It's just a matter of personal preference and comfort. Keep in mind that if I agreed with you, I would just as wrong as you are.
All the best,
Gary