Yes, it tells you of apps that lower their price or become free for a short amount of time. I have tried the other app miners out and Pandorabox is the best so far. It is easy to use and navigate and I have saved hundreds if dollars using it.
Another app that I like to use to save money is Redlaser. It is a barcode scanning app that gives you prices online and locally. The first time I used it I saved $30 at Best Buy! The best thing is that it is free now. I paid 99 cents when it first came out but I don't care it was totally worth it.