I've tried the power green one, and I'm not satisfy with its quality: the smell of the food may remain in my dishwasher. The Platinum Plus is much more expensive than Platinum.
Does Costco changed the product line at your warehouse?
Thank you for sharing it. I tried the Kirkland brand, but it had some scene remained on my dinnerware. It was very likely that I came to this conclusion due to placebo effect. It may also related to my family's cooking style or the hardness of my water.