I have worked with this company now going on 6 months. They are extremely knowledgable and have essentially the best english speaking VA's I personally in my 15 years of hiring overseas have seen.
There crazy intense vetting process ensures that the VA's are top notch.
Don't get me wrong though, they are definitely expensive, but they are so worth it. Would you rather spend $5,000 on bad hires or a few hundred on ensuring you get the best of the best...
Don't make the mistakes I made and try to figure out which VA is going to deliver. Spend the couple dollars and get one that can actually do what they say.