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Honestly I don't know Whale.io already got a review from BTCGOSU team, just an idea and information. If not yet, it's time to contact them for reviewing and their review is not biased by money, a trusted reviewing website.
That is indeed a very good idea, yes. Contacting BTCGosu shouldn't be too difficult either. One of the founders of the site, @efialtis, is still an active member here on Bitcointalk. A PM will probably be enough (or a mention here in the thread) and efialtis will become aware of whale.io.
To be honest, I don't know if there are any costs for the review, but I am sure that a review on btcgosu.com is much more meaningful than, for example, meaningless reviews on Trustpilot