Arc performance issues

According to Lincoln Electric, these are the top concerns welders have withb arc performance are: (1) excellent starting performance, (2) the ability to weld at low amperages, (3) crater fill capabilities to end the weld with precise control and without the high frequency reestablishing, (4) a smooth, stable arc with minimal AC rectification across a wide welding range, and (5) expanded balance range to narrow the cleaning zone adjacent to the weld.

Tons of good info, and a bit of salesmanship can be found at Lincoln Electric.com. They use it to sell their new TIG model, but it's not all salesmanship. It's solid.