Some observations on first glance:
Love someone taking another stab at the virtual assistant market. Landing page needs some help. 15 tasks for $30 seems insanely cheap, but it is not clear exactly exactly what the limit on the requested task would be.
The nebulousness of it is definitely a dissuading factor. Particularly, I didn't like how they given an example of buying flowers, but don't describe how payment authorization will work.
I'm not a believer in assigning small tasks to people you have no previous relationship with. It can very easily take more time to explain what you want, verify that you actually got what you wanted and deal with the risk of getting something you didn't want than just doing it yourself.
