I rarely buy store brands. The quality has gotten better, but it is still not as good as name brands. I buy name brands on sale, many times they cost no more than the store brands. If you have coupons along with a sale, the name brands are often cheaper than the store brands. Do not always assume that the store brands are cheaper, always keep your eyes open and use those coupons.
I power shop and buy in bulk when I can get things cheap, then I have plenty and never have to buy groceries and household items at full price. I also do not have to worry about running out of things quickly.