That was fast. I will not be partaking in ReviewStream and will not advise my readers to do so either. I do not consider ReviewStream worth my time to test it out fully.
I was already iffy about the program FAQ, but went ahead and wrote a review on there anyway. Upon submitting the review, the system immediately told me that it would not accept my writing, and to work on it. I spent about 25 minutes drafting up a decent review of my own video card, the GTX 550ti.
The website told me to hit back to save my work, edit it more, or sell it elsewhere, assuring me my work was not lost. Upon hitting back to retrieve my review, which I figured I would work some more on and turn in to Yahoo!, I was notified that the document had expired, and that sealed it for me: I recommend not using ReviewStream. It doesn't have a very professional look or feel to the site, it is not very organized, and the claims seem too good to be true. Indeed they are when no one even checks on reviews.
There are 4 requirements to not end up in "bulk pay" (1/5 normal pay rate). The first one is "If it does not meet our requirements, you will get bulk pay". The last one reads "If it doesn't meet our requirements, it will be rejected". Contradiction.
I read some other experiences with ReviewStream to make sure I wasn't being hasty. This one sums it up nicely.
I don't recommend anyone spend their time here. You are better off writing articles on Yahoo! or using PostLoop to gain your own hosting, and making your own review site centered around one topic. In the time it takes to write reviews until you get "30 USD payout" status on ReviewStream, you could have a nicely fleshed out site of reviews for selling products through Amazon or any other place where you are affiliated. Do not use ReviewStream.