You will find that the wire feed setup without the shielding gas does not allow you to go to the smallest size of wire. The result is too much heat for thin metal like 18 gauge. With the MIG setup you can use .025 wire. I have been using my 110V Lincoln for about a year and have been very happy with it.
One thing though is the MIG won't work outside in the wind because the shielding gas gets blown aside.
