I have some very bad experience with this website because:
Jobs- you hardly get any jobs if you live far away from US.
Even if you get the job you hardly can do the task because its either taken or out of your scenario.
Time- They take sometime forever to get the task done.
The pay rates in this website is really good no doubt. but still with the availability of the tasks its not even a supplement income.
Join only if you live close to US.
Good Luck!