Solid good 4
To be clear, GB is offering 300 points (6USD) for review.
This is OK site, not the best out there, but good.
PayPal is most preferred way to pay.
Only thing, You have to be ready in case of any problems to deal with support. To Your first 4-5 messages You most likely will get template answers which won't help you , but You will have to keep trying. As last "straw" mention "PayPal dispute" ..this argument will help You 99 % times to get their attention and proper solution.