Make sure you add something to the idea of "review site", rather than just releasing another site with the same idea. If, in a few weeks, you can't explain to me, and the viewer, why your site is going to be different, in 20 words, go back to the drawing board.

I look at it this way... Would they rather go to your site or Jane's Guide? Until there is a reason for some of them to pick the new site, why bother?
Either way, I'll gladly give you a password to review our sites... but if you make the site something really interesting, then I will actually *care*.. and so will the audience.