Brilliant LOL
This review makes me think other wise.
Sounds like a great idea, until you look at the Safety Warning: "-We are not liable for damage to your suitcase or car seat caused by use of this product."
You're going to strap 40-50 lbs of kid and seat to a carryon with little dinky wheels and a simple tube handle? That's just asking for the handle to get bent, or the wheels to break off the bottom while your kid is riding on it. Look at the wheels on any stroller, or for that matter the Gogo Kidz Travelmate, and then look at the wheels on your carryon. They are *not* built to take that kind of weight. So you might be saving the $60 by not getting something like the Travelmate, but give it a little time and you'll probably be spending more replacing your suitcase.
Bottom line: Could be real useful for carrying an empty carseat, if the suitcase isn't packed with much weight. Put a kid in it, and it'd be a good way to destroy a suitcase.