I run my older Miller 211 for sheet metal and my Miller 252 for most frame and heavy fab work. The 211 will do it as well, but I don't like having to change rolls all the time with the 211. I run an Everlast PowerPro 256D as my Tig machine. It's been a beast and has outwelded an older Synchrowave 250 a few times without blowing breakers.
I will personally admit, I hate the miller autoset. I think it dumps way too much wire most of the time. It will give you an acceptable weld, but they usually aren't super pretty. I always end up running my own settings for pretty stuff, but the autoset can give a good starting point.
I've blown up a smaller Lincoln within a warranty period and never much liked it after that, so I usually stay away from Lincoln on non-generator machines.
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I should also state, I got the 211 around 2016? ish used for 600, never had an issue with it. I got my 256D new in 2019, no issues either, besides usually HF adjustment stuff, and I got the second 252 used in 2024 for 600 as well. That one required a new cooling fan, and I stuck a new torch on it as well for good measure, bringing my total for that machine to around $1100. No issues so far with it within the last year.
The Millers seem to last very well under pretty continuous use, at least as far as I have experienced.