I use this very frequently. My only complaint is the quality of some of the experts. They will give you the wrong answer, but CHEGG still deducts that from your 20 questions. I have posted the same question multiple times because of incorrect answers and the new expert will often copy the incorrect answer that caused me to report in the first place, and give me the same exact answer.
There are some that don’t even bother to read the question thoroughly and miss the bold red letters that informs them that I am looking for something specific such as how to solve using a calculator. It’s extremely frustrating and I believe that CHEGG should credit you for incorrect/incomplete answers.
Another issue I have is that although you are given an opportunity to ask follow up questions, the experts don’t usually answer them. Some do, but not all of them.
Other than that the replies are usually quick and the answers provided are correct more often than not.