You save a fortune, I'm trying everything on my list from aldi (we don't have a lidl) and if it's any good I buy it again, if not I do what I can in there and then finish off in tescos. Find the fruit and veg, dairy, household, tins, cereals, frozen all really good only thing a bit hit and miss I've found is meat so just depends what ur standards versus budget are really.
Lidl nappies are fab my lo is in his 13 hours at night as he sleeps through and never a leak, I stock up when I'm near a store and you save a fortune, was gifted a pack of pampers the other day and tried to look pleased, lo was soaked through in the morning poor thing, back to me usual!