Stan, you make some good points. I really had not considered the fact that aluminum is going to need a bigger machine. I have never had the ability to weld aluminum at home so I won't miss not being able to, but it would be nice. How often would I use it? Hard telling. It may never come up. A spool gun is one of those toys that I always wanted, but never had. I honestly have only ever had the need but a hand full of times. I just send it out or take it to work and use a TIG machine there. The other expense is the Argon. Having an Argon bottle sitting around for use some day would be a waste. I generally just run co2 because I am a tight wad.