I submitted a couple of pieces of writing to Twilocity, a site that reviews and checks MS Word documents by running the writing through some macros. They were returned in a short time and the results were good. The blurb on the site says that their review should take you up to the next grade level and is aimed at American college students, but there's a lot in the report that comes back that could benefit ESL learners.
The writing came back with dozens of comments and suggestions, using APA style and The Gregg Reference Manual, which might be a little too prescriptive for some tastes, but many of the suggestions were good. It also produces a personalised list of points at the end of the paper suggesting areas for further study based on the number of times an error or weakness had occurred in the writing.
Older versions of Word struggle a bit with the display of the different editors. It worked well enough in OpenOffice but Google Docs was not able to display things very well.
It would be nice if different style guides could be chosen, but as a quick and cheap way of getting some useful comments made on writing, it is a service I would welcome if I were an ESL learner submitting an essay.