Clumsy awkward heavy things, been going for years. BOC Safire is much better and easier to use. Tried one a long time ago and they work but are no great benefit.
Wouldn't feel comfortable wielding one of those. It looks like it could be easy to knock one of the nozzles out of alignment to me. I used Victor burning torches for years without any problems - if I was buying one that's what I'd go for.