Highly recommend them
I've worked with ProofreadNOW for a dozen projects. Their website is easy and efficient to use -- it provides enough options to make the right choice for level of proofreading required, cost and turnaround time without being overly complex. They are fast and have always sent back their comments within the timeframe requested, and sometimes in less time. Their proofreaders are highly detail-oriented, and will typically make a few unexpected and valuable suggestions on each job. I highly recommend them.