Time, etc.

Assistants for entrepreneurs

Recently found this company that provides digital PAs. Has anyone here had experience with them? good/bad?
Looks a lot like Zirtual, except you are billed by the hour rather than by packages of hours.
@swaaanson I use Zirtual and it's interesting to note that the VAs from Time, etc. will write a blog post for you... my ZA has said they're not meant to do that.