The Telwin branded welders are rare in the UK. They tend to be distributed more in mainland Europe, and branded differently in the UK. I didn't realise there were any importers. Telwin MIGs are made in Italy so tend to be better than far eastern, but they are cost down mass market stuff so tend to be hobby market. Don't know where their TIGs are made - I can guess.
Do you have a link to some specifications? That would help us figure out what it's limitations might be.