I have been asked a couple of times before whether a $300 USB microscope or even a $500 Chinese brand can produce the same results one get from a research grade microscope. My response to this is always: You get what you pay for. Here is an example of a $500 Chinese branded microscope with a 2.1MP CCD Motic camera specially designed for microscopy versus a research grade Olympus BX53 with UPlanSApo objectives and a Canon 600D camera. Both used a 10x objective and bright field illumination, using the same subject.

You decide.