I only used it for a few hours. I bought it because my daughter (a high school student) was taking biology class and was interested in microbiology. I've had a few optical sights under $100, digital and "kids" microscopes, but I figured something better was needed. I am a professional scientist and have over $1,000 worth of optical microscopes in my lab. For the price I was expecting a slight improvement over the cheap scopes I've had, but to be honest it's a steal compared to scopes at work that cost ten times as much. Build quality is solid and it has all the accessories and controls you would expect. There are enough parts and controls that will take a bit of practice if you're unfamiliar with taller scopes. Once you've used lab-grade oscilloscopes, you'll feel right at home. I am very happy with my purchase. We dripped in water from the pond and my daughter almost immediately spotted parameciums swimming around some sort of algae. The fact that it comes with a 100x immersion lens and contains some oil is a bonus, although most people would be happier with lower magnifications.
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