The econotig welds just fine, I've made good welds with it no problem, but it's extremely limited. Duty cycle leaves much to be desired. No AC balance, no postflow control, no adjustments of any kind except for the amperage and polarity. I have been told that some parts are not worth fixing when they break. The HF on mine at work is giving trouble, haven't looked at it myself yet, but was told that it is not an easy repair.
You can't have a machine that's too big really, unless you need portability. Too small, well, can't really boost that amperage can you?
If you get a used one, be sure to check that the torch and hoses are in good shape and easy to get parts for. I have had some trouble with older ones in the past that do not show up on the manufacturers website anymore. Doesn't mean the parts aren't available, just that they can be hard to rustle up. A new torch adds another 250 - 300 to the price tag. Make sure other accesories are there too. regulator/flowmeter, foot pedal... A used machine may seem like a good deal until you have to go around getting all the parts to make it do what you want it to.
also, go to your local welding supply and see if you can try a few out. Sometimes they are willing to do this. wouldn't obligate you to buy one from them, but you could get a feel as to whether you will like it or not.
good luck,
jon
A miller XMT 304 has 3 circuit boards, thats it and its an equivalent machine. The invertec has at least 8 boards in it scattered everywhere. And it dosnt even auto switch for different line voltages! Argh!
