We used them exclusively until we realized that the Target Up and Up's are cheaper. If there is a coupon though for Costco, I will still buy them if it's a good deal.
They are pretty much the same as Huggies Snug & Dry. At our Costco depending on the size the actual cost per diaper is cheaper in Huggies. So far size 3 and size 4's are cheaper per diaper in Huggies.
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Hated them. DD leaked through them all the time day or night. We use Pampers Baby Dry and don't have that problem with them. They're only about a two or three dollars more for them at BRU, too. Well worth it to me.
Re: Costco (Kirkland) diapers