Ranked in these QuestionsQuestion Ranking
Pro Rating system
After you've received your translation, you can rate its quality, with your review then shown publicly on the website (apparently including low ratings). This provides an incentive for them to retain high-quality translators, as they can identify the unreliable ones.
Pro Revision system
After you've received the initial translation, you can request further revisions of it through the web interface, to resolve awkward phrasings, typos, etc. These revisions are done for free, if the issues raised are fair/justified.
Pro Relatively cheap
The translation cost is pretty good, at 10 cents per word. (as of March 2021)
Pro Fast translation (24 hours)
Their standard translation estimate is "Within 24 hours", and this proved true for my first trial. (it was completed shortly before then)
Con Not top-tier quality
My first experience with their translation service was not great -- the translation quality was not much better than Google Translate. However, this may not be representative of their services overall. (since they have many translators, it's understandable that some may cut corners at times)