I think that it is okay. My family doesn't have sensitive skin. It seems to wash okay, and I tend to wash only w/ warm water and use half the powder. Lots of suds, but lots powder residue in the sink too, w/ the drained water. I do put in the powder, then the water, and swish around a few socks about 20 times to help dissolve the powder. We still get residue, and it can be particularly bad on dark clothing. This isn't a problem I have had, say, if I used brand-name Tide, for example.
I've been using cheapo liquid detergent for darks lately--at Walgreens or Fred Meyer it can be as cheap as 2.99 (w/ coupon) for enough for 50 loads, and I tend to use even less than the amt recommended. Still gets stuff clean/smells good/no residue. Cheaper? I'm unsure!
I have used it and it cleans well, but has a strong smell. Maybe they have improved it now. I just bought another pail to try, but haven't opened it yet.
Don't know about Sam's Club, but at Costco you can return ANYTHING you are dissatisfied with.
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