-that's a good welder for the money, welding aluminum isn't going to be easy with that gun without some practice, and I agree that you're going to want a spool gun and 100% argon if you're going to do it- Welding steel with that welder won't be any problem at all with flux core or with gas-
-what are you planning on doing with this unit? because over a sears model I'd have to recommend one of the two big names lincoln electric or miller electric (hobart)- granted the lincoln unit similar to this is about 500 bills and so is a comparable miller
-i spent about 100 dollars on a cheap ass century flux cored mig welder and it shows- i mean, the thing can run a bead but it's tough to get the settings right and the heat is not infinitely adjustable, only has a high and low setting so i'm constantly fucking with wire speed to get a good bead- welding with my friends lincoln MIG with gas is like night and day compared to my unit- basically what i'm trying to say is that you get what pay for when it comes to the big name welders IMO