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After signing up for them I must say I am a little disapointed with the whole thing, there seems to be very little documentation and it now takes 3 - 5 days!
Compared to Google which is so easy, fast and extremely informative through the entire process I am surprised they are so popular.
Money makes people willing to jump through HUGE hoops.
I think once you get the hang of it, you will find it very easy to use. Whether or not it is cost-effective for your particular use, only time will tell.
The "wait for review" is a pain, though.