I've been buying Red Heart acrylic yarn for four decades, give or take. It's my go-to yarn for crocheting baby afghans, which I do in quantity, partly because it's totally machine washable. I've bought it by the bushel, in many different colors, and enjoy the flexibility to mix and match from different skeins in the same project.
Last week, though, I got a stark object lesson in the degradation of one of my favorite brands. My friend had bought a couple of skeins to knit a sweater for her grandson, and when it was time to sew the pieces together, to her dismay, here's what the sleeves looked like:
Ironically, this yarn is sold under the rubric of "No dye lot," so you can theoretically buy multiple skeins of the same color and not have to worry that they won't match perfectly. Well, the color was the only thing that did match in this project.
Caveat emptor. Red Heart has tainted a previously fine product. If you buy it, give it the feel test, especially if you're buying more than one skein. If you have a choice, go for the softer "original" version. The stiff, scratchy yarn isn't quite as nice.