I like the design and feel of the site. I also like the pricing model. It is really easy to see what you get for what price.

I don't think I would personally buy it because my brain does fine at the moment. I usually figure that if an idea is important enough, I'll read about it in my email enough to think about whether I should do it.

I do however think this is a good way to show to your customers that you care and are welcoming feedback. Keep at it, I think it will do good.