I hired a staff member for a month through Globol a few months back. I was reasonably happy with the results, for the cost.
Communication was great, both from my VA and the manager I was working with. My VA's English skills were ok. Perfectly fine for communicating, but you would never mistake them for any kind of native speaker. They took a little while to get up to speed on my task, and didn't do it quite as fast as I could, but at the price, it was a good deal. My task really required people with better English skills, so I didn't end up hiring them for longer, but I would definitely recommend them for lower level or simple tasks.