Another problem is that you can find a lot of messages with an offer to buy verified writers’ accounts. Perhaps this is one of the reasons why users complain about the quality of Ultius essay writing services (example).
Who are their writers? According to reviews of people who worked in this company, Ultius is “largely relying on college grads who need some extra income” (source).

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Future Writers
Working at Ultius will not only sharpen your writing and editing skills, but it will also allow you to take part in a fast-growing company that is focused on writer success. Thousands of professionals from around the country enjoy the autonomous and lucrative nature of the job.
Ultius is also deeply committed to providing knowledge-based jobs for American graduates who are struggling with the current economic climate. Our mission is to conveniently deliver high-quality content for our global client base, and our writers are an integral part of that process.

And the other disadvantage, that it is not possible to get direct contact with a writer.
As for case study, admission essay, article, business plan, multiple choice questions and several other services, they are unfortunately not available for the order. However, they still have enough services a student might need.

This is a nice category that we rarely see from writing agencies. It’s the highlight in most Ultius.com reviews. You can order a resume, CV, or cover letter here.
There’s another thing in the fine print: they say they cannot guarantee 100% uniqueness of the content. Free revisions are available, but urgent amendments come at an additional cost. We can’t help but label this as Ultius scam. What do you mean by urgent revisions are paid? When a student sets a deadline of 7 days, they expect a perfect paper by then. If they require minimal revisions, they expect them to be done in less than a day, so they can still submit the paper on time. Ultius charges to revise the papers. If you don’t want to pay, the revisions will take at least a week.