I bought one. Used it once and it is back in the box. It's junk.

I have an older DD. 750 I think. It really isn't that bad.
I think it can do a better job than many people can do by hand.
This product is one that people either love or hate without
too much in between.

I also have a old blackdiamond sharpener. It is a wonderful unit.

I also have a darex M5 that I don't like very well. It has a good
reputation but I find it difficult to use and I can't get good results
like I get with the Black diamond.