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i purchased a TB 301g last january and wish i had waited to buy the 302. don't get me wrong, the 301 is a geat machine, but miller improved it a significant amount, and the new features are just too irresistable. i'm concerned that i would take a big loss if i traded it in right now, and if it wouldn't be cost prohibitive i would like to know if the new additions on the trailblazer could be installed or retrofitted to the last model? i'm mainly interested in the hot start, the adjustable dig, and the lift-arc tig. the lower sound level is a plus as well.