they used to be a careful mixture of upmarket and low price, but Tesco beat them on pricing and then Waitrose beat them on gentility. But I think their products are still okay and not outlandishly expensive, and I'm quite happy shopping there as well as other places.
I've lost track of what I'm supposed to be doing with my Nectar card, though. My Tesco card goes towards airmiles and my Waitrose card gets me free newspapers and coffee, but what is Nectar good for these days?