old thread I found here but since I own a Econotig I decided to post that I'm very satisfyed with the machine, I've done most jobs I ever needed in the shop with it, I have even welded some cracked engine aluminum heads with it, I used helium to help penetrate this thick castings, of course the duty cycle must be kept low so the machine won't burn up, even titanium is easily welded with this machine.
the only task I haven't mastered with it yet is brazing, I found that a special rod is needed for this job but I can't get it over here.
In stick mode I love the way it starts and keeps the arc lit, I use this mode mostly for welding cast iron with nickel rods.
for the rest of the jobs I use a Miller 185 MIG welder that I really love, I'm a very satisfyed customer of Miller products.
just my 2cents.