Kirkland's Best is one of my favorite brands. Though I don't have a Costco card I can always rely on Kirkland's Best to be at least somewhat decent. The ibproufen is generic and inexpensive, not powdery and in sufficient number to quell a series of headaches. honestly, a "small" container has enough for a month's supply for a migrane sufferer.
I keep the bottle around the office for co-workers, though I use it for myself on occasion. I like it enough to take it when I need it, but the ibproufen is upsetting to my stomach. This is no fault of Kirkland's Best since ibproufen is proven to upset sensitive stomaches. However I will continue to take it because the benefits far outweigh the risks of taking it.