I bought one of these Rume packing systems about a year ago. Which is unusual for me, as I saw it on Facebook and am used to a lot of overpriced, crowdfunded stuff there, but this looked pretty decent for the price. So I took a chance.
It's not a bad little system, actually, if you're not looking for compressed cubes. Basically, it's a set of packing cubes sewn together in a foldable unit that acts as a hanging garment bag when opened, and hangs in a closet. It's pretty easy to pack--you just lay it out on a bed and stuff items in the various cubes. The unit is then folded and placed in a carryon bag. Overall, pretty lightweight, though I haven't compared the overall weight to my other "standalone" packing cubes.
The other side of the unit acts as a garment bag, which will hold a suit or two at most. I've only used it for a sportcoat, and it obviously added to the bulk of the bag. I think maybe two dresses for a woman or one suit and dress shirt for a guy would make it with this unit, depending on how much other stuff you're carrying.
I've tried the Rume system on 18 to 22 inch carryons. In the 18 inch bag, it was too big, but it works fine in a 21 or 22 inch bag depending on if, or how much, "hanging" items you're carrying.
There aren't any real advantages over standalone packing cubes, and as stated, it's no good if you prefer compression cubes. But for the price, I like it, and it's kind of neat being able to just hang the unit in a closet when you get to the hotel.