In a moment of weakness, I ordered a trial package of several kinds of sheets from EC30 (made by Proctor & Gamble). Hand soap, dish soap, toilet bowl cleaner, laundry detergent and body soap, I think.
When the package arrived, the smell was so strong that I immediately got a headache. I left it to sit, open, in the back room for a few days before trying one. I used ONE of the hand soap sheets. It felt really nice, a rich creamy lather, but the smell was so awful, I gave up and pitched the entire box. Yes, I contacted them - but never received a response.
It was a complete waste of money.
I have been using Persil unscented for over a year. It got better reviews from Consumer Reports than Tide Free, which I'd been using previously. It's highly concentrated, so very little used. About half as much as regular laundry detergent would be my guess. As I can't find it locally, I get it from Amazon subscription, which saves a little. We've been happy with it thus far.