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I got the AT&T Scanner app because Red Laser wasn`t scanning something (I think it was a Data Matrix code). The AT&T scanner app will scan UPC, QR and Data Matrix barcodes. Like Red Laser, it will compare product prices, take you to reviews or take you to websites and videos. You can also manually enter the code instead of scanning the barcode.
I only use this app for Data Matrix barcodes, which has only been once in the last 6 months. I prefer Red Laser because it has more features such as directing you to your local library for book searches and it works faster.
Image Source: http://itunes.apple.com/us/app/at-t-code-scanner/id381292358?mt=8