Any experience with Earthwash strips?

As it says, anyone have any experience with Earthwash laundry strips? Or anything similar? The strips are supposed to be dehydrated laundry detergent. The idea is to use less plastic (and incidentally leave a smaller carbon footprint by not shipping the weight of plastic and water).
Do they work? Any problems?
Thanks.
Joe

I have used them, not that particular brand, though. They worked fine; my clothes were not destroyed or anything. It’s just laundry detergent.

Thanks, DPRK.