I have had my hf 90amp mig for many years. It has paid for itself more than a couple dozen times, in those years. It may be a cheapo, but I treat it like it was a high $$ machine. I use Lincoln wire, been the best for me out of all that I tried. (except one, but I was told it WAS Lincoln under a different supplier name)
In my experience with this machine, you want to hear bacon cooking, as mentioned by Dave. I find that the best setting for the dial is almost 7..... 6 if it's 1/8" thick...... And I stick with that for just about everything. I just do small circles and watch how the wire pushes into the work. I watch to see how the bead is forming and adjust my travel speed accordingly.....