I think the biggest issue with ANY choice of welder is the availability of repair parts. It doesn't matter how great of a welder it is, once it breaks, if you can't repair it - it's junk, which to me, means it was junk when it was new, just shiny and currently-working junk.
Unfortunately, seems even some of the big brands suffer from this. Recent example, my buddy just went through this with his Miller plasma cutter. It's an older model, but wasn't cheap.. it crapped out and appears to be the control board. Can't buy one. There's a repair service for them that is around $700 IIRC. I referred him to that guy but not sure why he chose not to do it - either lack of funds/willingness to part with the funds, or maybe the guy told him his wasn't repairable.
Anyway y'all please don't think my lack of activity on choosing one means it was time wasted typing up these excellent responses. I will eventually get one, it's just low on the list as I don't have a pressing need (at the moment) and I've still got plenty of backlog to catch up on from what feels like going on 2 months of health issues that have kept me out of the garage. I swear the last 2 days worth of work out there felt like a LOT.
Richard