I think you guys are missing out on some opportunities just by dismissing these apps.
For example, my girlfriend and I went to Kohl's last weekend looking for a stainless steel pressure cooker. We found one but it was like $60, so I scanned it with ShopSavvy and it showed Walmart as having it for $42.22. She then said she was just over there and they didn't have it at all. So we just went up to the Kohl's register and asked if they price matched. They looked at the Walmart price and price matched it right there! Walked out of there with the thing for like $45 after tax.
I think it's awesome if it shows Walmart prices for less cause then you can always go elsewhere and possibly get it even cheaper (if the place has a 110% pricematch guarantee).