Phil
In the US and Canada, these were usually sold for apartments, tiny homes, college dorms, etc, where you didn't have a regular automatic standing machine hookup. My guess would be some 2% or less of sales in the overall washer market. So keep that in mind. I would guess that almost anyone who could hookup and afford an automatic would have chosen one instead.
For a hobbyist like many of us, they are an alternative way to do wash, a fun occasional few loads of clothes. They are not for everyone or everyday, but they are effective and economical. I have a mid-70's Hoover #0519 that I use about once a month. I wouldn't want it as my only machine, but it's a fun alternative at times.
As long as you don't try king sized bed sheets and throw rugs, you be AMAZED at how quickly you can get through tons of clothes with economical water usage. And the spin speeds in the spintub are about triple what an automatic will do, your dry time is cut down to 1/3.