Works great ....good enough for my need and as suggested by Paul
I have yet to try this as my whetstones are new as well, however I failed to notice this is quite a bit smaller than the Shapton pro stones I also purchased. I can likely get it to work when the time comes but having a larger stone would be preferable.
You should give it a try! I (Paul) use this at home actually with all my Shapton and Naniwa stones and it works fine (especially considering the price) for my modest sharpening needs. I just put the stone to be flattened in the Naniwa adjustable stone holder, wet it, and hold the flattening stone groove side down and rub it in a figure-8 kind of motion over the stone and it does the job. For the price it won't match the bigger version or a diamond plate of course, but for getting started it's not bad and it's easy to handle and store!