I don't have one so I can't tell you if it's good. But I can tell you why I don't have one?
The Garments 2 Go models are certainly sexy and the concept seems nice. They are practically like the vertical (normal) 22" rollers with three differences:
1. They have a bigger (deeper) and separate suit compartment.
2. They are horizontal.
3. They are somewhat lighter.
The third point amazes me and I don't know what the engineering behind this is. The first point comes in handy when you are taking more than two suits. Two suits fit in the normal compartment but not three. The G2G bag should be able to take three.
The second point is the main point that breaks the deal. Since they are horizontal the bag is much harder to maneuver in tight places, i.e. airplanes. I have a hard time sometimes rolling my normal 22" down the aisle, I wouldn't even want to try a horizontal bag. The same goes for elevators and escalators which one encounters often when traveling.
This is why I would recommend against the G2G bag unless you absolutely need to carry-on three suits and you are only traveling in the front cabin so you don't have to finagle it down the aisle. You could carry the bag but bumpint it into your fellow passengers wouldn't be very nice.
Suiters in a 20" bag are rare because simply the shoulders of anything bigger than a size 42 will hardly fit in width. The Travelpro Plat5 19" roller does have a suiter panel according to one of the reviews on ebags. But it is not listed in the official feature list. If it does have the panel you are looking for, I do recommend it.
Otherwise, you can pack a suit perfectly fine without a suiter. You can either wrap it around a shirt folder or use one of the folding techniques for the jacket which you can easily google. In my personal experience that works just as well as a suiter, especially if you use some silk paper to separate it from the rest of the clothes and put the jacket in the suitcase as the last piece. Of course, the silk paper gives the impression as if your butler packed the case. If you are traveling with a woman and undo your suitcase in front of her, she will be impressed. Guaranteed.
Till