We have one in our local "Range" and I used to buy a few bits in there rather than going to another shop if I was already in there. Branded stuff (e.g. cereal, crisps, soft drinks) are on a par with corner shop prices i.e. quite a bit dearer than your average supermarket. Their own brand frozen stuff is of course their specialty and some of that can be good value if you like ready meals and burgers etc. But again most of the branded stuff is dearer. They have a very basic fresh food/chiller which is nothing to write home about.
They do have offers, mostly on cans of beer/cider which can be a bargain. But I wouldn't shop there on purpose.