[rksprst]

Also, wanted to mention that I think your main issue is going to be the behavioral change that your site requires. Users aren't used to making decisions by using a Swayable.

With new users that you acquire, the product might be awesome at first but once the novelty wears off, the users usually go back to making the choices in whatever way they were before.

Others might would not be interested because while this does solve a problem of deciding between two items, people have already established processes in making those decisions (be that asking their significant other, looking at product reviews online, or asking friends). Using a Swayable doesn't make the decision making process so unbelievably simpler to make a user take the effort to change the way in which they make decisions. As a rule-of-thumb, products that require a large behavioral change (and I think this is one of them) need to provide a 10X improvement for the user in order for them to consider making a change.

I'm sure you've probably thought about these issues, would be interesting to see how you address them and how consumers respond. Although this might just be "fun" enough that makes them use it.

BTW, there's a great paper on this topic: http://hbr.org/product/why-consumers-don-t-buy-the-psycholog...