This is just my opinion...If you are going with a lower end machine, I would check the model numbers and buy the one at the lowest price. You should be able to learn the functions of the machine yourself using the manual.
If you are buying a higher end machine, you may need the classes and support that a dealer will be able to provide, and also take care of the warranty servicing.
I worked at a plant where we put together tv/vcr combo units. They were all the same except for the nameplates..even Curtis Mathis...only difference with the Curtis Mathis? The techs tweaked them a little more for clarity of picture/sound. We put panasonic, JCPenny, Sears, Wards, and other names on them...same model number except for the ones that got an additional turn of a screw driver.