I have found that he little cheapo ones are much more difficult to use. The stage adjustments are not nearly as nice if they are there. Also the focus aparatus is not nearly as nice. Some cheap kids ones only have a gross adjustment. The optics are not that great either on thos. I would go on ebay and spend about 200 to get a really nice one that has been retired from a HS or college biology lab. Also the light on the cheap ones is not nice. If you want to be able to do fecals easily and precisely you want 3 major things
1) a mechanically adjustable stage, so you don't have to slide the slide on a stationary stage
2) both gross and fine adjustment of the focus allows you to focus on different planes in the fluid, for more accurate results
3) an internal light source, those mirrors are just a plain pain in the rearside
But then again, I work in research and the only scopes I have really worked with were price in the 6 figure range so I am spoiled. But i did buy a cheap one and was very frustrated by it and haven't touched it sense, I do plan to buy a better one in the new year.
-----
Derek Affonce
DeKeAff Exotics
dekeaffexotics.com