Miller are great machines mate.The trouble people seem to have when buying a welder is the look at the highest settings and amperage they can go up to.
what they then find out is when they plug them into there 240v home supply and whack the welder up full to weld ,say 6mm steel all the fuses in the consumer unit in the house blow.
The other thing you need to look at is the wire feed set up and the wire feed motor.
its ne good having a welder that feeds wire like shite.all you will get is shitty bird pooh welds and a big birds nest of wire in your wire holder on your welder lol.
also co2 on its own is no good for thin metal.co2 is meant for thicker stuff.
Co2 gives a hotter weld pool.
You need a good co2/argon mix for thin metal(as mentioned above)co2 will do the job but you will get better results with argon mix.

Also you have just reiterated what i said about the good versus the bad as far as welders are compared,a lot of people who are starting out in welders first off buy a cheap machine then find they are having problems from word go.
Then later down the line they end up having a go with a quality machine and they never look back.
The trouble with the cheap set ups is the wire feeds to jerky and all that happens is your constantly getting either the wire stuck to the tip or the wire stuck to the job!
Then when you do get a good run going the damn thing blocks in the liner lol.
Good machines are very forgiving and even a first time welder can get a passable bead going within ten minutes.

Its a case of the old saying "buy cheap buy twice"