Strength was definately a concern as I want to make MTB and BMX frames which will need to take a beating, I don't mind spending the time learning to TIG, I'm fascinated with the process and metalwork in general, but being a computer geek haven't had the practical experience... I've done a mig course in the past and the general thing seems to be spend time on welding and practice on lots of scrap until you're confident, the Covell video makes it look super easy but I realise the guys a pro!