CW, I'm afraid you cannot generalise. I use both 230 and 110 VAC gear in my system here in Switzerland. I've just bought a pair of Jadis 200 mono amps from Canada, and they could easily be converted to 230VAC by resoldering a couple of wires on the two power transformers. Spectral gear cannot be handled that way. I use a couple of EquiTechs with excellent results on my 360 monos and a PS Audio 600 for the Spectral pre. I would never pay the ridiculous mark up prices, which they charge for Spectral gear here in Europe. I also run two Krell 300 monos, US version, which I use for part of the the bottom end of my system, through a $400 buck stepdown transformer which delivers over 5000 watts at ample amperage, which drive the amps beautifully. Getting a European version of similar quality, would have cost me at least double. So you have to research and enquire very carefully to find the best solution. I've found, that both the Equitechs at 1500 watts delivery each, and the PS Audio at about 460 watts do not degrade the sound, au contraire. But I would beware of cheap stepdown transformers, which of course the Gray is not, only I am not familiar with it. By the way, should you touch base in Switzerland, why not get in touch?
Cheers,
Cheers,