I've been taking their Quantum Mechanics and Quantum Computation course that is about to end. I would recommend it to anyone interested. The course doesn't do a good job emphasizing the linear algebra prereqs (basically the only prereqs of importance) and it sounded like a lot of people got frustrated with that early on. A college course in linear algebra definitely suffices and one could even learn this sufficiently for the course on your own if you were ready to dedicate some time to it.