I haven't used one, but they're really similar to Warré hives. really the only part missing is the top bars, which aren't difficult to make. the importance of the top bars really depends on how you plan to manage your hives, though. the way I do it, top bars aren't really necessary and might contribute to what's sometimes called "false floor syndrome." basically, a colony with plenty of room to expand swarms when they encounter top bars as they're building downward. having one long uninterrupted cavity (as in the Japanese design) might, therefore, make early swarming less likely.
skipping top bars would make harvesting slightly trickier, and pretty much rule out taking individual combs out separately: you'll have to take whole boxes instead. that's the way I do it anyway, but I do sort of like the top bars there for support. decreases the chance that the comb will all just fall apart when you take a box off. the Japanese hives do use a mid-box support that may be enough to prevent collapse, but also complicates harvest a little bit.
one other thing to keep in mind is that many (maybe all?) traditional beekeepers in Japan are still using Apies cerana instead of A. mellifera. I won't claim to know what that means for the hive that's most suitable for each species in any particular climate, but it's something to consider. those two species do have fairly different proclivities, strengths, and vulnerabilities.
my advice would be to try both Warré and the Japanese design and see which works best for the bees and you. they're effectively identical apart from the top bars. if you can do the Japanese one, you can do a Warré. if you've got some of both and you decide you like one style better than the other sometime down the road, it will be really easy to switch them all to the style you prefer.