I have taken classes at the Clay Studio in Philadelphia, which has Brent B and Brent C wheels. They have literally thousands of people come through the studio every semester, and the wheels keep ticking.
I agree with Neil, however; given the wheel mounted motor nature of the Whisper I'd go with something else for school or full time production use. I don't know the cost of that motor but I would imagine it's more than the usual suspects of "regular" DC motors.
Do you mean you recommend against the Whisper there is something about the motor that makes it less suitable for production use? and, if so, what is the issue? (this is an honest question.)