I've had one for a few years, on a shelf, in my storage room.
One of my sharpening students asked a question about his and so I dug it out and was able to answer his question.
Then I started using it since it was out and all...
You know, it's kinda so-so. But then I bought some diamond plates for it and a leather disc to go on it and NOW!!!!
I like it, it has a permanent place on my sharpening bench.