I had some and didn't like them. You've no idea what pressure you've set the regulator at apart from a crude sticker on the knob. Unless you are experienced at using oxy/fuel and know what a flame should look and sound like I would avoid them. At least with proper regs you can set the pressures on the gauges and know they are correct before trying to light it.
Plug Regs are for the,please dont`take offence,for the scrap burning types.You can throw them about for fun.But at what cost.Better think about Regs with dials,could save you money in the long run.You buy cheap you pay twice!