I can answer this question. I live less than 15 miles from the Rockvale Square (Lancaster, PA) outlet store. I get there frequently.
First, this store is newly renovated. It is NOT dirty and not disorganized. Unless it's a very busy day and customers have carried around items and misplaced them. Or left clothes in the dressing room.
Another poster was correct: the normal outlet prices are not always much less than the on-air price--but you're not paying shipping. There are often across the board discounts that make the prices incredible.
For example, right now apparel is 60% off the lowest marked price. I got a Liz Claiborne jacket (A234741) for about $20 today. Right now, everything else in the store that's not on a better discount is 40% off the marked price. I got two big mercury glass lighted trees (H200284 sold out on-line) for $18 each; soap rocks pack of three for $11 each.
Right now the store is having a super special on Valerie's lighted spheres--a pack of three for $13.14. I almost hyperventilated when I walked into the store and saw that price! They don't have the newest colors and the colors vary from day to day. But I've seen purple, blue-green, green, red, holiday multi, silver, gold. They aren't packed in the foam packing but shrink-wrapped in a bundle. I've gotten a number of colors. They all got home without breaking and they all work just fine.
So, to answer your question, YES, the prices at the outlets are great. In fact, I'd say the outlets are the only QVC-run places where you'll get real sale prices.