Try yelp. Hack Reactor has 150+ Yelp reviews http://www.yelp.com/biz/hack-reactor-san-francisco
"Also, you get this hoodie for writing a review so...)"
- http://www.yelp.com/biz/hack-reactor-san-francisco?hrid=mVJT...
But if you flip that bias on its head, 5 stars becomes a mediocre rating. That's ok if you've disclosed what you've done, but out of 165 reviews only one mentions that people are incentivzed to write reviews with free swag.
The lack of negative reviews may seem strange, but I genuinely believe that everyone who has written about HR does so in a sincere manner (whether it be positive or negative). I can understand how it seems shady, but with a $17k tuition, a "free" hoodie is not enough to sway a review one way or the other.
That's intuitive but factually incorrect. There's a large body of empirical research that shows that giving away trivial tokens has a significant impact. This is true for everything from charitable donations to sign-ups for services to survey responses. Not to mention ratings for college courses, which are, in the aggregate, more expensive than Hack Reactor.