I have tried several other writing and editing services but this is the first one that I have found to be consistent in quality and has not let me down in timeliness. Grammar, syntax and sentence structure tend to be the downfall of the other services. The errors make it obvious that the writers are not native English speakers. In regards, to Ultius, I had seen several negative reviews and it made me hesitant but I tried a few small projects and was confident about giving them a larger assignment. To date, I have no complaints but I also specifically request my writers and maybe that's the difference. Once you find the writers that matches your style and needs; stick with them.