Definitely not worth it! Can not recommend! I chose the 12 hours option、but it took more than 12 hours and even did not notice me anything about the delay. Moreover、my editor did not follow the reference rule、so I asked one of the CS staff and the person said that they can guarantee to revise it again until the deadline. However、when i emailed the request file as what the person told、the CS one suddenly changed again and the new one did know nothing...I needed to explain all of things again and the new one was like i need to check whether it can be possible or not on time、so will email me back about the possibility...As expected i could not to get any answer(even they will do it or not)、so just revised by myself and barely managed to hand it in on time. And The answer arrived the following day! It was just waste of my money and time a lot. If you had enough time、you should choose different one. Hope this review can help you make the right decision.