They don't have that good writers. Their writes did a bad job a few times. Specially with scientific papers. Some of their writers don't even have any idea how to do a scientific paper. They just put something to cover the number of pages, instead of doing it correct and good. I had to fix everything. Once I threw it and wrote it all over again. I get some papers done, when I get too busy with work and school. I need help not because I don't know the stuff its because I don't have time. I can tell the difference of a qualified writer and un undergrad. I don't believe their writers have the qualification that they say they do. Some of them even can't do a simple college term paper. My last order, the writer wrote most of the paper irrelevant to the topic. Only a small part of the paper covered the topic. It was done wrong and I paid a lot of money for it. When I asked them for revision they said I have to pay because I was one day late for a free revision and they are sorry that their writer did it wrong. This is all I got. They are too expensive, they don't have good writers and when they messed up you will have to pay to fix it. It's all about ripping off your money. Don't give them any work.