I liked powdered Wisk from the time they introduced the "ultra" concentrated formula in the 90's until 2003 or so, when they discontinued both the powder and the tablets, both of which I liked and were almost as good as German Persil. The liquid was OK-ish, but I never cared for it and the liquid Wisk HE was always too sudsy for me. The powders could be used in HE machines if you were measuring carefully. In any case, for about 10 years or so it was my favorite American detergent.
When they discontinued the powder and tablet I was basically left with powdered Tide HE if I wanted to buy American.
Even all became too sudsy in the 2000 and I had to give it up and buy Perwoll for stuff like silk and wool that can't be safely washed with enzymes.
Over the last 10 years I've bought a bottle of liquid Wisk HE every few years to see if it got better, and the last one I bought was when they released the Unscented version. Still too sudsy and I think they cut down on enzymes, because it doesn't wash nearly as well as the 90's version, particularly when it came to stains.
It will be interesting to see if they keep all, Purex, or both. I noticed that lately they have their original formulas without enzymes and the new ones with enzymes (but not as many as TOL brands).
I've tried the American versions of Persil. The pods are "meh, can take them or leave them, nice perfume but way too strong". The megaperls work *really* well, but can only be used for whites and light colors, they'll leave bleached spots on colors if you use warm or hot washes, which I do. I only tried the 2-in-1 liquid -- works really well, smells good (altho strong), but I'm not fond of liquids, so I dunno if I'll use it much.
People who don't like the smell of Persil should try the Sensitive, which altho not unscented is not that strong. I haven't tried it because it has fewer enzymes than the other formulas.