I haven't tried this detergent, but the other Costco detergents I have tried have been stellar performers. My son uses the Kirkland pods and I use the liquid "free & clear" version. The nice thing about Costco is, if you're not happy with the product, they will take it back with no questions asked.
I'm using it and it performs very well (for the price)
I mean, It's not ultra fantastic, but does a very decent job. Suds level is minimal and it rinses well in a Samtag and LG front loaders as well as the other 6 top loaders that are my daily drivers.
but I did try Costco HE powder that came in a box. It was really clumpy. I used it anyway and I actually ended up liking it. It sort of grew on me. At first I wasn't sure. Right now, I'm using Windfresh from Sam's Club that is in a bucket identical to this and I LOVE it. But I wonder why this Costco Kirkland version doesn't say HE if it is indeed low sudsing? That's the only reason I haven't tried this.