$600+ vs $30? Who the fool?
Anyhow, I have three of the knockoffs in rotation...they still work after, I guess, 6 months. The fill valve and regulator are seemingly less responsive...but they work. I just tightened the tiny screw on the gas regulator valve on one of them, it was loose.
On the other hand, my Kiribi valve is kaput...blows out gas. If I get around to send it back for service, this would be the third time back to the shop. Now that it's out of warranty, don't know if I'll bother, likely to cost more than $30.
Bics and those types are cheaper, but I'm a fool... but not $600 worth.