You've missed "just plug it in to a normal existing socket in your garage". That works fine for me.
True! Although I have heard stories of sockets melting and electrics exploding. The wiring in my home is fairly new, so probably okay.
I don't need fast charging and certainly not willing to pay close to £900 for it.
When charging the Zero SR/F Premium with its included Power Pack charger connected to 120 volts, according to the bike's display, it uses 11 amps, not the kind of current that would normally cause a meltdown. (Thou, the cord does get a bit warm)
I have an amp meter and will verify if the display is accurate and if not, will update this posting.
The charger comes with an adapter to plug into a 220 volts outlet but I don't know if the rate of charge will remain the same, cutting the amperage to a half, or if it will charge faster under the new voltage, at the same 11 amps
I haven't had time to install a 220 volt outlet in my garage yet. (Planned for this weekend, thou)
As I understand, European bikes are configured differently in part because there, 220 volts is the standard.
Using 120 volts is slow but works just fine for overnight recharge.