Another review of the Travoy: http://pathlesspedaled.com/2012/11/r...yptic-trailer/

I own a Travoy and like it. I also like the looks of that Carry Freedom as well. The difference for me was the fact that the Travoy attached to my seat column and therefore took what little weight was on the tongue and distributed it to both wheels. With one that attached to the back it puts all weight (that is on the tongue) to the rear wheel. A negative of the Travoy is that it makes having a bag on your rear rack difficult.

Since the Travoy is closer to the bike it also tracks a bit better than your normal pull-behind. That may not be an issue for you.