i think the 110v option is probably more gimmick than anything else.
having said that, my pa200 works reasonably well on 240v, especially given the price.
on the other side of the coin, forget buying parts or getting any sort warranty service (at least in canada) other than getting a replacement unit when the once yearly shipment of new ones comes in... and you pay for the shipping of your defective machine from wherever you live, to ontario.
for all intents and purposes, when they fail... they are literally a throw away machine... of course, i have no idea how long it will take to fail. it may work fine for decades... there is just no way of knowing at this point.
however, they are still light years better than any a/c machine. i doubt that i will ever buy into the argument that d/c output is anything less than exponentially better than a/c output.
it's an old saying and i believe it still holds true today... 'no self-respecting welder uses alternating current'.
if you are at the level where you don't know the difference between a/c and d/c output, at least try to understand that it is extremely important to have d/c output, and that it probably makes sense to buy one of these ultra-cheapo chinese machines, if that's all you are willing to spend... being careful not to break it.:thumbsup: