Actually my rebadged 857d comes with Quick brand, and it cost slightly cheaper than Atten 858d ( it cost about $70 in my country ) and no I got the 220v version.
As the matter of heating up time, I can say that 857D heats up a lot faster than 858. You can see in Madell 857d user manual, the 857d used smaller element.
The 858d I've used also comes with Quick brand, internal part also look similar with Atten 858d that Dave reviewed before.
857d element :
http://www.madelltech.com/Reworkstationparts.html (look for qk857d element).
The reason I said that the 858d gets hot, if you take apart the nozzle you will see that the 858d only use mica paper to suppress the heat from the heating element. and the 857d uses mica paper and glass tube to suppress the heat.
I am not saying that the 858D is a bad choice, but I have found better option than 858D. And I just want to share my opinion.
The 857D does have one draw back, the air just blow too much even at minimum setting.
For now, I just use my 858D for some light reworking, or when working with plastic component. And the 857D for the heavy lifting, removing glued BGA, remove metal shielding etc.
Sorry for my english, have to work on that.
Regards,
Chris