i have a telwin mig and tig set, very good they have done lots of hard work, there machines are also re-badged as sealy, lincoln and a few others. My mig is 265/2 250 amps but goes down to 20amps so handy for 6mm wire auto body work, tig inverter is very nice use with a fronius torch.
A few years ago i though the transformer was gone on the mig set so i retired it under a bench, last year i moved into a new premises with only single phase supply, got a guy to look at the set, he cleaned a few contacts i think and now the machine is like new again, very nice on stainless 304, a very course arc.