I have one and I actually thought it was wearing down fast but it actually was fine . I sorta feel like a idiot for thinking so , I had it for 6 months and the fine side felt super fine. I was all upset one night and write a bad review and the company emailed me and asked me t send them a picture, I did and they said it’s normal wear . So after I was told I was wrong they still offered me a new one to compare with my old . They couldn’t have been any nicer! They have to be the best customer service for a company that I’ve ever dealt with. I got the new stone and they were def right I think it was because I stopped using that and started trying other stones and when I got back to that stone I thought the XF side was worn t bare metal... my bad .. but yea great product I think , the case is great n it cones with a little angle guide with a magnetic bottom , it really helped me out when I 1st started . It was the stone that made me fall in the sharpening hole cause ever since then I’ve been trying to Sharpen as much as I can .. give it a shot !! Two thumbs up!I am sorry I cant be more help, never used one. I would say follow dmt break in protocol if you get one.
Hoping to hear from someone who tried one.
Russ