The gentleman who has the 66 says that a table top would prevent the inner workings of the machine to perform out of the cabinet.....I was wondering if the same it true for the 99? And does the 66 just have the knee control or can one opt for a foot pedal? I am just full of questions, but I cannot seem to find a site that separates the models in this way. If anyone knows of one, I would be very interested in studying about them! Thank You!