Didn't for me, as I don't buy much in the way of branded goods and we turned out to be allergic to their laundry products - except for DTwatCat, who was allergic to the cat food instead. I did like the Lidl Parma Ham and Nuremberg (sp?) sausages that were cheap for the quality, but that wasn't enough to do the weekly shop in there. In any case, every time I have gone in the hope of being proven wrong, the things I've actually wanted have been out of stock, especially in terms of meat.
I would think that if you usually buy big brands of processed meals, cereals, bread, biscuits, pizzas and snacks, you would save. If you only ever buy Value brands or don't get those sort of things, I don't think it will help.
My go to place for ingredients is a Turkish Food Centre. Good quality and a wide variety of veggies and fruit, fresh herbs, nuts, pasta, rice, grains, oils, dairy, spices, olives, tomato products, bread/flour/baking goods - and the best Baklava for miles. I get a bag of GF TwatCat food from the Waitrose on the way home and eggs/milk/etc from the Co-op round the corner plus any pork products requested by DP.