I had stumbled onto some threads discussing that A2Z universal rear disc adaptor, and I haven't found anyone blatantly bashing the thing. There aren't a lot of stories about how well it works either though.

I was wondering fi anyone has used one on a F-series frame (Especially a CAAD3 like mine.)
I would really like to go to disc in the rear of my bike, but not if it's going to be a tuning and functional nightmare.

Any input on the Brake Therapy unit would be useful too.