Have utilized Killerpapers for several papers, everything works out very well and they have saved my tail from failing modules which I otherwise would be too busy to see to. My only advice would be to ensure that you utilize one of the writers who has a high number of papers to their name, not all writers are of the same high standard. Working with Tom has been smooth and he consistently produces high quality papers and understands what to do if rubrics and clear instructions are shared, I have worked with another writer but found the quality to be more rushed and less to my liking- but you get what you pay for.