I've used similar functionality on a real estate website, allowing people to see that the information they want is behind the registration form. Previously, the

I've used similar functionality on a real estate website, allowing people to see that the information they want is behind the registration form. Previously, the client averaged 1-2 signups a day. After the change, they started seeing 6-7 per day. So this definitely can work - but as with every other user interface component you should use A/B testing and see if it works for you before committing to it 100%.