I'm in Middle Tennessee, and went through the BRP site to register, and did the basic 3-wheel course in a parking lot at a local college campus. The same training organization also does basic and advanced 2-wheel motorcycle classes, and is considering adding an advanced 3-wheel course.

I spent more time waiting in line at the BMV than I did once I was standing in front of an agent. I did the eye test, and they took a new picture.
So two years later and the TN BMV still accepts the certificate as proof.

The training organization also gives you a card you take to your insurance agent, which gets you a discount on your motorcycle insurance.