Will not read your request and will upload junk. They know you will not turn in the assignment that they submit to you and therefore will not refund your money (they require proof from the professor that it's a bad assignment - only an idiot would turn in their terrible solutions). They will wait until the absolute last moment and then ask you to clarify what was wrong, and when you clarify, they tell you the assignment was done to requirement (it never is). It's simply a scam and I recommend to stay away.