No womp womp womp - obvious disadvantage. WB has data listed on their site and a few bullet points in support of the comments above. Overall it performs to and in some cases outperforms other discs on the test they ran. It does depend on the wheel you use it with, but there are perks all around.
http://www.wheelbuilder.com/aerodisc-data.html My own experience, I started with an Aerojacket. Now I run an actual "disc wheel" (carbon over spoke), which really isn't anything more than a permanently sealed carbon jacket. I saw no noticeable performance change for myself. I do recommend you tape it on instead of using the Chicago screw set it comes with, for two reasons. The first, it's next to impossible to get the jacket to sit smooth with those screws, trying to avoid bow in the shape. And two, the jacket will not BANG against the rim when you hit a bump. They cut it pretty close and tailor to your wheel size, but I have yet to see a jacket that sits flush. 3M electrical all the way around the edge, it won't go anywhere and it should maintain it's lenticular shape, just watch the brake track and half/half the tape as you run it around (half on the rim, half on the jacket).
The first world problems, you have to remove your cassette to put it on, you have to tape it, you have to remove the cassette to get it off, if there is residue from the tape you have to scrub it off your wheel, and you don't sound like a freight train.
To move to a "disc" back wheel, 100 dollars for the Aerojacket benefit is the cheapest speed in the disc world.
Regards,
J. Smith