It's good! I actually just went through the signup process, and indeed, it took me 2 minutes to install and see the previews on my blog.
I don't know whether your pricing will work for a casual blogger, but the product is interesting.
For bigger publishers, it's definitely easier to justify the expense, especially if you can show some ROI on increasing ad revenues because of better retention.
For bigger publishers, it's definitely easier to justify the expense, especially if you can show some ROI on increasing ad revenues because of better retention.