The Curts are easier to install and personally I think looks better than the Hidden Hitch brand and also a lot more one piece. Curt is also cheaper also more people have bought the Cuts.
As for Yakima Double Down is nice, but Yakima/Thule are super expensive also you need to spend more because they don't come with locks, cables, etc.
But $140 for installation? Seriously dude. If you know how to tighten a wrench, you can install the hitch with a friend in about an hour. And that's an overestimation. I did mine in 30minutes.
As with visibility, the CX-5 does have a third brake light like all cars.
Personally I got the Curt Class II (I should have gotten the Class III, more options for 2" hitch) and the Rola 3 Bike carrier: http://www.etrailer.com/Hitch-Bike-Racks/Rola/59403.html
The Class III hitches have anti sway systems, Class II doesn't so the Rola on my Class II wiggles and moves around. But I guess it's meant to do that.
Got them both from eTrailer.com
Thanks for your comments. Part of the problem is that I live in Canada and it's prohibitively expensive to ship anything from the US here, and the prices for the exact same items are usually way higher. I've seen the curt hitch listed in the US for as low as $160, but here it starts at $240-260. I'm going to keep researching though. BTW, the installation is only $60, the rest of that is taxes - we love our taxes here in Canada :-( I'm going to check out etrailer.com and see what their shipping policies are.