I think if we look at the suehiro in that it is a synthetic so the user can get a very refined edge that is very predictable the first time and if the edge off a naniwa 12k or chosera 10k is worthy, this will take it the next step. The particle rating is .5 micron which if you consider the shapton 30k is .49 microns so they are essentially the same. Jnats produce a finer smoother edge IMO but theres the learning curve and the trial and error of the nagura progression and tomo match as well as the base stone itself. Then its water only yes or no, how many tomos, which tomo, hone to almost dry etc. These are all worth finding out I agree but some aren't interested in going through all that. So for a synthetic, and all the ease it brings, I find it useful although for my personal razors, I prefer an ozuku asagi or nakayama asagi mizu. Just got 2 more, nakayama koppa asagi and an oohira kiita. So more experimenting.