Have you looked at the packing tips sticky at the top of the page? It includes some nice pointers (and a video!) on how to bundle-pack a suit. People who use it claim that the RedOxx Air Boss can handle a suit in each side pocket with space in the middle for shoes and other stuff. Details in the sticky I mentioned. I don't have one and don't wear suits, so that's about as far as I can comment there.

Other considerations - garment bags are an inherently wasteful of space. The volume available to pack is way less than the volume of the bag.

Wheels add weight and take away space, so a wheel-less carry on (like the Air Boss) will hold more, weigh less, and fit in smaller spaces in the overhead bin. A rolling briefcase holding your heavier stuff provides a platform for rolling your larger carry on through the airport.

Small planes can equal gate checking can equal problems making connecting flights. Small rollers, like that briefcase, and wheelless bags can often be carried on, permitting you to avoid the gate-checked crowd at the other end.

The Lat56 manages to hold even less than the average garment bag and that's saying something.

At LAS, there's a TSA checkpoint past the shops and toward the Southwest concourse that's hidden away and severely underutilized. I think you can get to all of the gates from it and there's never a line. Just don't follow the herd to the main check point.