Here is what one guy thought of his pulser.It's from the Chaski web-site,on a powermig post.

I've been reading your posts about the Power Mig 300 and it sounds like a great machine. I currently have a Millermatic Pulser. I am totally disatisfied with the way it welds aluminum. It welds steel great. I have tried for hours to get a consistant bead bead but have been unable to. I bought it to weld 14 to 16 gauge aluminum. I have tried, .030, .035 4043 & 5356 wire, different gas settings, stainless brush cleaning for better arc starts, brush cleaning of groung clamp area for better electron flow, different wire feed speeds, trim and amperage settings, different thicknesses of material, multiple pieces of the same thickness material and joint design so as to try and repeat the same welding perameters, spoolgun drive roll pressures, all with the same results. At best the weld starts out cold bunched up for the first 1/2" then gets slightly better for the next 1" and after that it the material is to hot for the recommended setting on the machine. Is this just the nature of welding aluminum or is the Power Mig 300 have features to address these problems? Miller talks about increased welding speeds of 144" per minute. Is welding at 2.4" per second realistic? I think not. I am considering selling this unit and buying a Power Mig 300. Do you guys have a lot more control with your 300's. Can you weld in all positions? Also does the machine have adjustable wire feed and volrage at for weld starts? Do you still have pulse on pulse when using the spool gun or just pulse? This machine seems so advanced that my local dealer is clueless. Any comments would be apreciated. Thanks