I started with a HF 110v mig, and ran into the duty cycle frequently. Then I got a Lincoln 220v AC/DC tombstone and have never hit the duty cycle. And for all the talk about stick being harder to learn than MIG, I'm not so sure that it's not a bunch of sales talk for MIGs. MIGs are more convenient for thinner metal, but sticks do well for thicker metal, and you never have to worry about running out of shielding gas in the middle of a project.
Mark does bring up a dilemna--do you buy a used tombstone that everybody is familiar with or buy something like the Everlast that maybe isn't so well known. If resale isn't an issue and you prefer one over the other because of warranty, weight or ability to use 110v, it is your money to spend.
IMO, the reason so many tombstones are up for sale is people get these things, use them a bit, and then when the owners stop welding, they put them up for sale. Mine came from a guy who was moving and didn't want to move it or his 300 lb rockwell drill press which I also bought. If there are some sales statistics to show that people are dumping tombstones to buy newer technology units, let's see the numbers.
And I agreed with Soundguy. If we keep moving our production capacity overseas and become dependent on foreign production for key components, we're leaving ourselves open to disaster at some point down the road, sooner or later. Anybody remember WWII when the US had scrap metal drives? If you don't have it when you need it.....