Grey amplifier Imports from Japan?

I have a feeling this has been discussed before, but I can't find the thread. I am leaning towards a Luxman or Accuphase SS, class A/B integrated. Something like the Luxman 507.

Looking online, the savings importing from Japan against buying locally, are enormous. There are clearly, real risks,, the loss of warranty support, having to use a transformer to change the voltage, which must have the potential to degrade the sound.. Against that, brands have a reputation for reliability.

If anyone has bought from one of the Japaneses sites, can they decribe their experience? Thanks