Yes, I’ve personally imported many instruments (> 20 basses) over the years. My dealings with the Japanese, either via a large corporate entities ((like Ishibashi, Ikebbe, Shimamura), bass specialists (Geek-in-box, BassDirect Japan) and individual sales on Digimart have been generally hassle-free. Certainly, the Japanese end of the transactions have been smooth. Sadly, not the case with couriers or Customs at this end though. This is a tale of delays and expense that needs to be factored in if you decide to purchase. These concerns are not unique to purchases form Japan, however.
I would recommend, as a first trial, to engage with Ishibashi via their English-language site. Ask questions about an instrument you are interested in and gauge their level of responsiveness, speed of reply, and overall level of customer service. Compare with your average Joe in Europe. You might be surprised.
Good luck!………but it comes with a wallet warning about how easy it might become.