The most helpful feature is being able see what it's like for students in different English countries! I can also check my writing style compared with other languages/cultures using this tool as well because there are many options that allow me do so (ease of use).
You cannot have more than one language selected at once when comparing styles etc., but you don't need too much editing skills either - just click away until satisfied then copy&paste into your document or blog post if applicable. For example how easy would be having multiple versions from US vs UK? That way we could compare our written english against eachothers without relying solely off native speakers' feedback since they may not know exactly which culture their speaking about. Also great platform where anyone who wants help finding an editor will find plenty willing volunteers :).