When you buy an SIP you are buying the fact that it was easy for you TO buy an SIP welder. In other words you are paying for SIP's marketing costs, whats left over after marketing costs for the welder is what you get. Getting products on B&Q and Halfords shelves doesn't come cheap and they (B&Q, Halfords) dont want to pay much either.
This equals total junk but well advertised.
This equals total junk but well advertised.